- The 3 Layers of Womb
- Pregnancy Hormones
- Splitting of Zygote Cell
- Egg Falling and its Implantation
- Development Phases
- Gene Expression inside Fetus
- Embryo Creation Sequence
- Different Creations
- Starting of Heartbeat
- Embryo Sex Appearance
- Hearing, Sight, then Lungs Function
- Bones before Flesh
- Delivering Mother vs. Donator Mother
- Breast Feeding Period
- Birth of 6 months
- Orange GnRH
- Blue Estrogen
- Red Leutinizing hormone (LH)
- Green Progesterone (Prog)
- Hypothalamus releases Gonadotropin-releasing hormone (GnRH)
- GnRH causes the pituitary gland to produce FSH. FSH reaches the ovaries via the blood stream. FSH causes the follicles to mature. Follicles are little balloon like sacs filled with cells and fluid and hold an egg. Each follicle contains one single egg
- Maturing follicles produce estrogen. Estrogen signals the brain, which slows do down the FSH production and starts LH production in pituitary glands.
- Estrogen also prepares the uterus for ovulation by thickening the blood vessels lining the uterus.
- Estrogen production boosts LH.
- LH surges and causes ovulation. The egg escapes, travels via the fallopian tube and goes to the Uterus.
- The empty follicle from which the egg was released is called as Corpus Luteum or yellow body. The Corpus Luteum produces Progesterone. Progesterone signals the brain to stop producing LH.
- Progesterone also prepares the uterus by thickening the uterus lining and also producing mucus to ease the passage of the sperm. The egg sits and waits for 24-48 hrs.
- If you get pregnant, the hCG hormone is produced by the developing embryo. This hormone signals the Corpus Luteum to keep making Progesterone and Estrogen. If you don’t get pregnant, the corpus luteum disintegrates (called as Corpus Albican) and stops producing Progesterone and Estrogen. The low levels of Progesterone and Estrogen causes menstruation to occur.
- The cycle starts all over again. 
Following to the above explanation, it clearly shows that level of Hormones inside the womb changes, especially Progesterone, which is responsible for being the woman ready for pregnancy, it begins low then it increases, and then it decreases again.
This is described in the following verse:
Allah knows what every female carries and what the wombs decrease or increase. Everything has measure with Him. [13:8]
The second part of the verse refer to the Hormones level change in the womb which will cause woman to carry (becomes pregnant) which is the first part of the verse.
What Is a Zygote?
After a female egg is fertilized, the resulting one-celled organism becomes known as a zygote. Once the egg is fertilized, the zygote begins a two-week period of rapid cell division and will eventually become an embryo. The zygote divides through a process known as mitosis, in which each cell doubles by dividing into two cells. This two-week stage is known as the germinal period of development and covers the time of conception to the implantation of the embryo in the uterus , as shown in the below image .
In the following verse, prophets are swearing by God who created them, saying:
O my people! I ask of you no reward for it. Lo! my reward is the concern only of Him Who made me [Fatarani]. Have ye then no sense? (11:51)
"Except Him (i.e. but Allâh Alone I worship none) Who did create [Fatarani] me, and verily, He will guide me." (43:27)
Save Him Who did create [Fatarani] me, for He will surely guide me. (43:27)
The word used for creation is “Fatar” which “create” is one of its meanings, but literally it means “split or divide into smaller parts” too, as in the following:
When taking this meaning, the only state where “human” has been split into 2 or more, is when it was a Zygote cells and which keep dividing till it becomes a “blastocyst”.
Quoted from: Week 4 of Pregnancy: The Egg Implants
The fertilized egg and your uterus are making contact this week. After completing its six-day journey through your fallopian tube, the blastocyst you'll one day call your baby reaches its ultimate destination and begins to attach itself to the uterine lining. About 30 percent of the time, implantation bleeding will occur as that bundle of cells burrows its way into the uterine wall. 
In the following Hadith, it says that within 40 nights: the sperm stay in the womb where it falls like blood (drop), then it becomes clot then become a lump:
Mentioning “falling as blood drop” after being sperm and before becoming a clot, this a clear indication for the falling of fertilized egg through fallopian tube as described above.
This process of Egg implantation is described in the following verses:
Did We not create you from a worthless fluid? 2 (20) Then We put it in a firm place of rest (21) For a known period. (77:22)
The average length of time for prenatal development to complete is 38 weeks from the date of conception. During this time, a single-celled zygote develops in a series of stages into a full-term baby. The three primary stages of prenatal development are the germinal stage, the embryonic stage, and the fetal stage.
Germinal stage: Conception occurs when the female egg (ovum) is fertilized by a the male sperm.
Embryonic stage: The embryonic stage begins after implantation and lasts until eight weeks after conception.
Fetal stage: Prenatal development is most dramatic during the fetal stage. When an embryo becomes a fetus at eight weeks, it is approximately 3 centimeters (1.2 inches) in length from crown to rump and weighs about 3 grams (0.1 ounce). By the time the fetus is considered full-term at 38 weeks gestation, he or she may be 50 centimeters (20 inches) or 3.3 kilograms (7.3 pounds) . All are shown in the below image .
In the above explanation, the development of the embryo passes though development phases: germinal period, embryonic, then fetal period. These changes are referred in the following verse, as creating the baby in different creation periods:
He created you from one being, then from that (being) He made its mate; and He hath provided for you of cattle eight kinds. He created you in the wombs of your mothers, creation after creation, in a threefold gloom. Such is Allah, your Lord. His is the Sovereignty. There is no Allah save Him. How then are ye turned away? [39:6]
Quoted from: Gene
A gene is made up of short sections of DNA which are contained on a chromosome within the nucleus of a cell. Genes control the development and function of all organs and all working systems in the body. A gene has a certain influence on how the cell works; the same gene in many different cells determines a certain physical or biochemical feature of the whole body (e.g. eye color or reproductive functions). All human cells hold approximately 30,000 different genes. Even though each cell has identical copies of all of the same genes, different cells express or repress different genes. 
Quoted from: Can genes be turned on and off in cells?
Each cell expresses, or turns on, only a fraction of its genes. The rest of the genes are repressed, or turned off. The process of turning genes on and off is known as gene regulation. Gene regulation is an important part of normal development. Genes are turned on and off in different patterns during development to make a brain cell look and act different from a liver cell or a muscle cell, for example. Gene regulation also allows cells to react quickly to changes in their environments. Although we know that the regulation of genes is critical for life, this complex process is not yet fully understood. 
Quoted from: Gene Expression
Gene expression is the process by which information from a gene is used in the synthesis of a functional gene product. These products are often proteins, but in non-protein coding genes such as rRNA genes or tRNA genes, the product is a functional RNA. The process of gene expression is used by all known life - eukaryotes (including multicellular organisms), prokaryotes (bacteria and archaea) and viruses - to generate the macromolecular machinery for life. 
As short summary of the above explanation:
- Genes are short sections of DNA that contain all physical or biochemical feature of the whole body.
- Genes pass through a change process called Gene regulation where genes are switched On or OFF.
- Gene expression process is done during Carnegie stage in human embryos between the 4th – 9th weeks which will cause body organisms to start its formation, such as eyes, ears, etc..
He it is who fashions you in the wombs as He wills. Lâ ilâha illa Huwa (none has the right to be worshipped but He), the All-Mighty, the All-Wise. (3:6)
He composed (Rakabak) you in whichever Image (form) He willed. (82:8)
Knowing that, using the verbs “fashion” and using the word “Rakbak” means to structure or to compose, as if talking about a construction of blocks, knowing that this verb can’t be used as construction a human being, therefore these verses clearly refer to the gene expression process; as following:
- ALLAH constructs “Rakab” our genes blocks inside our wombs, which will lead to
- Complete our DNA image (fashion, “Sawar”) inside our genes, which will lead later to
- All our physical and emotional features.
Let’s read the following miraculous Hadith:
خلاصة حكم المحدث: إسناده صحيح على شرط الشيخين
Thereupon the person said to him: You are surprised at this, whereas I have heard Allah's Messenger (may peace be upon him) as saving: When forty nights pass after the semen gets into the womb, Allah sends the angel and blows in him the soul. Then he fashions his sense of hearing, sense of sight, his skin, his flesh, his bones, and then says: My Lord, would he be male or female? And your Lord decides as He desires and the angel then puts down that also and then says: My Lord, what about his age? And your Lord decides as He likes it and the angel puts it down. Then he says: My Lord, what about his livelihood? And then the Lord decides as He likes and the angel writes it down, and then the angel gets out with his scroll of destiny in his hand and nothing is added to it and nothing is subtracted from it. (Muslim - Book #033, Hadith #6393)
- On the 40th (day or night), Angel is sent by ALLAH to the embryo, during the Carnegie stage.
- The Angel will blow the soul into the small fetus, where then its heart will start beating.
- The Angel will construct the image of new human, means the genes expression process will start, (not necessary instantly it may take weeks).
- The Angel will request from ALLAH, the features such as: hearing, eyes, color of his skin, his bones shape, etc… means complete the 44 chromosomes of the new human.
- The Angel will request the details of whether male or female, which means building the last 45 & 46th chromosomes, the sex genes.
- Then Angel write down (which means in certain place not necessary in the genes) 2 more things:
Quoted from: Week 4
These notes cover the fourth week of embryonic development, which is the beginning of organogenesis, (specific tissues and systems are beginning to differentiate) from the trilaminar embryo.
Quoted from: Week 5
Facts: Week 5, 31 - 35 days, 5 - 7 mm
In the Week 5 & 6, there is 2 distinguishable phases of embryo creation, that in:
Week 5: the embryo shape is taking the shape of Leech (type of segmented worms).
Week 6: it will be like a chewed substance, and during this week some essentials parts of human body has been created like: heart, liver, umbilical cord, but others still not created like eyes, ears, lungs which will come later as we will see later.
Thereafter We made him (Human) as a Nutfah (mixed drops of the male and female sexual discharge and lodged it) in a safe lodging (womb of the woman). (13) Then We made the Nutfah into a
O mankind! If you are in doubt about the Resurrection, then verily! We have created you (i.e. Adam) from dust, then from a Nutfah, then from a
The word “Mudgaha” means literally a chewed substance, where teeth shape appears on it, and this is exactly the shape in week 5, as shown in the below images :
In the following chart, it shows how all embryos forms starting with same steps, but later on after passing the Carnegie stage, it will differ from each other and start forming its final shape whether human, animal, bird, fish, etc..
In the following verse it mentions that after being “Mudgaha” (i.e. Carnegie stage, shown in the above image as stage A) bones and flesh will appear, and then it will differ in creation:
Thereafter We made him (the offspring of Adam) as a Nutfah (mixed drops of the male and female sexual discharge and lodged it) in a safe lodging (womb of the woman). (13) Then We made the Nutfah into a clot (a piece of thick coagulated blood), then We made the clot into a little lump of flesh, then We made out of that little lump of flesh bones, then We clothed the bones with flesh, and then We brought it forth as another (different) creation . So Blessed is Allâh, the Best of creators. (23: 14)
Mentioning it will become a different creation, this to note that it’s only after being in Carnegie stage, then the different forms of human, animals, birds, reptiles or fish will take its shape.
When will I be able to hear my baby's heartbeat?
From the date of the last menstrual period, the fetal heart will begin to beat on the 22nd day of development. This means that by the 5th week of pregnancy, the heart is beating. Until week 9, the fetal heart rate will increase 3.3 beats per day. In the early stages, the fetal heart rate is approximately 80-85 beats per minute (bpm). However, by the 9th week your baby's heart beat will be in the range of 155 to 195 beats per minute. 
Re: What causes the first heart beat?
Because beating is an intrinsic property of the cardiac myocytes, exactly what causes the heart to begin contracting is essentially a cell biological question. Unfortunately, there is not yet a definite answer to this question. We are beginning to understand how cardiac myocytes are specified very early in development, long before the heart has even formed. And we are learning more about their differentiation--that is, how these cells, which initially are not any different from cells that will give rise to the stomach or to muscles in the arm, develop the characteristics that allow them to contribute to the beating heart. From research in these areas, it is clear that certain things are required in order for the heart to beat. For instance, cardiac myocytes must have contractile proteins, such as actin and myosin, that are properly assembled into a scaffold (known as a sarcom ere) that allows contraction to take place. In addition, these cells must have specialized structures called gap junctions, which allow them to communicate so they can beat together in a synchronized fashion. Thus, while it is clear that certain elements must be in place for the heart to beat, it is not yet clear what stimuli are responsible for initiating contraction. 
It’s shown very clearly in the above chart, it’s during the 6th week that heart will start beating, meaning between the 36th – 42th days after pregnancy, but to know exactly when? Let’s read the following Hadiths:
خلاصة حكم المحدث: إسناده صحيح على شرط الشيخين
Abdullah b. Mas'ud reported: Evil one is he who is evil in the womb of his mother and the good one is he who takes lesson from the (fate of) others. The narrator came to a person from amongst the Companion of Allah's Me ssenger (may peace be upon him) who was called Hudhaifa b. Usaid Ghifari and said: How can a person be an evil one without (cornmittilng an evil) deed? Thereupon the person said to him: You are surprised at this, whereas I have heard Allah's Messenger (may peace be upon him) as saving: When forty nights pass after the semen gets into the womb, Allah sends the angel and gives him the shape. Then he creates his sense of hearing, sense of sight, his skin, his flesh, his bones, and then says: My Lord, would he be male or female? And your Lord decides as He desires and the angel then puts down that also and then says: My Lord, what about his age? And your Lord decides as He likes it and the angel puts it down. Then he says: My Lord, what about his livelihood? And then the Lord decides as He likes and the angel writes it down, and then the angel gets out with his scroll of destiny in his hand and nothing is added to it and nothing is subtracted from it. (Muslim - Book #033, Hadith #6393)
(7) Narrated 'Abdullah bin Mas'ud: Allah's Apostle the true and truly inspired, narrated to us, "The creation of everyone of you starts with the process of collecting the material for his body within forty days and forty nights in the womb of his mother. Then he becomes a clot of thick blood for a similar period (40 days) and then he becomes like a piece of flesh for a similar period. Then an angel is sent to him (by Allah) and the angel is allowed (ordered) to write four things; his livelihood, his (date of) death, his deeds, and whether he will be a wretched one or a blessed one (in the Hereafter) and then the soul is breathed into him. (Bukhari - Book #93, Hadith #546)
The above Hadith talks about a period of 40 or 45 nights or days, and these are in the 6th week of pregnancy, where an angel is sent to blow the soul of the new enfant where then and only then the heart will start beating.
As mentioned in the Hadith that it may be on the 40th or 45th night (or day), some used these uncertainty to fight Islam and to say why it’s unknown for the prophet to know exactly when the blowing of soul, but this is also a miracle where there is a difference between a girl or boy embryo will start beating where girl starts before by few days, and maybe it’s because of its size (ALLAH knows better).
Therefore answering the above question in Science section about: what exactly caused the heart to start beating?
It is because the angel sent by ALLAH to start the life of the new child.
Quoted from: Pregnancy week by week
Week 11: Baby's genitals develop
After the Carnegie stage of weeks 5 & 6 explained above, the fetus will continue developing till in week 11, its gentiles start to appear and then it’s possible to know whether it will be a boy or girl.
O mankind! If you are in doubt about the Resurrection, then verily! We have created you (i.e. Adam) from dust, then from a Nutfah, then from a clot then from a little lump of flesh,— some formed and some unformed, that We may make (it) clear to you. And We cause whom We will to remain in the wombs for an appointed term, then We bring you out as infants... (22:5)
After mentioning the Carnegie stage, ALLAH mentions the following: “We may make it clear to you”, and the only thing that will be clear for us and it’s more important for all parents and doctors is to check the health of the fetus and its gender, and this a sign that it will appear only after passing the Carnegie stage “Mudagha”.
Quoted from: Pregnancy week by week
Week 18: Baby begins to hear
Week 30: Baby's eyes are wide open
Week 32: Baby practices breathing
As shown above the hearing will be ready before eyes then lungs, this fact is mentioned in all the following verses where they are mentioned in the same order too:
He is the One who created for you ears and eyes and hearts [Afedah]. Little you are grateful. (23:78)
Then He gave him a proportioned shape, and breathed into him of His spirit. And He granted you the (power of) hearing and the eyes and the hearts [Afedah]. Little you give thanks. (32:9)
Say, “He is the One who has originated you, and made for you ears and eyes and hearts [Afedah]. How little you pay gratitude!” (67:23)
The word “Afedah” that is translated as heart in the English version means actually more than heart, but most probably the “lungs” as mentioned in the Arabic translation for this word and it’s different than heart.
12- Bones before Flesh
Quoted from: Pregnancy week by week
Week 15: Baby's skeleton develops bones
Week 17: Fat accumulates
Week 29: Baby's bones are fully developed
Week 35: Protective coating thickens
Week 36: Rapid weight gain begins
In the following verse, clearly it mentions the creation of bones first then it will be covered by flesh:
Thereafter We made him (the offspring of Adam) as a Nutfah (mixed drops of the male and female sexual discharge and lodged it) in a safe lodging (womb of the woman). (13) Then We made the Nutfah into a clot (a piece of thick coagulated blood), then We made the clot into a little lump of flesh, then We made out of that little lump “Mudgha” of flesh bones, then We clothed the bones with flesh, and then We brought it forth as another (different) creation . So Blessed is Allâh, the Best of creators. (23: 14)
And similar to the technical expression of flesh coating the bones, ALLAH uses the similar expression as “clothing”. Let see this miracle process in the following movies:
1 From Embryo to Fetus
13- Delivering Mother vs. Egg Donator Mother
Am I the biological mom of the child conceived via egg donation?
The pregnant mother’s body is responsible for the growth of the fetus. The fetus takes its required fluids and "food" compounds from the mother’s blood via the placenta for the 40 or so weeks of its development. It is the mother’s flesh and blood that results in the baby's flesh and blood. She is the child’s biological mother and the child is her biological son or daughter. 
Of course, you know that a donor egg recipient gives birth to the baby. But, did you know that a donor egg recipient/birth mother's genes will affect how the donor egg's genes are expressed? It's true. Did you also know that a donor egg baby has the blood of the birth mother in him/her and lives off the birth mother's cells while in uterus? That's also true.
Those among you who make their wives unlawful to them by (Zihâr) (i.e. by saying to them "You are like my mother's back.") they cannot be their mothers. None can be their mothers except those who gave them birth. And verily, they utter an ill word and a lie. And verily, Allâh is Oft-Pardoning, Oft-Forgiving. (58:2)
Knowing that this concept is what legally and official widely accepted too.
The immune and nonimmune protection provided by milk results in a lower incidence of necrotizing enterocolitis and other gastrointestinal and respiratory infections in breast-fed infants than in formula-fed infants. The incidence of otitis media is also lower than in formula-fed infants. In addition to protection against some infectious diseases, breast-fed infants might also be protected at later ages from diseases that are sequelae of infectious insults (eg, insulin-dependent diabetes mellitus, lymphoma, and Crohn’s disease). Immune factors provided by human milk that compensate for their delayed production by the infant are summarized in (following) Table: 
It’s clear that all immune factors that may benefit the infant must pass within duration of 24 months (2 years) maximum; which is mentioned in the following verse too:
Mothers shall suckle their children for two whole years; (that is) for those who wish to complete the suckling. ... [2:233]
And using the word “complete the suckling”, as referring to the whole process of transferring immune systems from mothers to children, which needs a period of 24 months.
Mortality and Morbidity
A study by the National Institute of Child Health and Human Development (NICHD) Neonatal Research Network was undertaken to relate other known risk factors with likelihood of survival and impairment. The study reported that 83% of infants born at 22-25 weeks' gestation received intensive care (consisting of mechanical ventilation). Of all study infants whose outcomes were known at 18-22 months, 49% died, 61% died or had profound impairment, and 73% died or had impairment. 
The duration of 22-25 weeks, is within the 6th months of the fetus with a highy need for intensive care for the new born baby, and younger than this it mostly won’t survive.
Let’s read the following verse:
And We have enjoined on man to be dutiful and kind to his parents. His mother bears him with hardship And she brings him forth with hardship, and the bearing of him, and the weaning of him is thirty months [46:15]
In the above verse, it mentions the carrying of a child till its weaning (which was mentioned above is for 24 months) is 30 months, this means that minimum pregnancy duration could be: