"The cells of the embryo now multiply and begin to take on specific functions. This process is called differentiation. It leads to the various cell types that make up a human being (such as blood cells, kidney cells, and nerve cells)."
More About Week 4:
A pregnant parent might see implantation bleeding or feel a bit of cramping when the blastocycst implants in the uterus.
Once implantation occurs, the cervix gets slightly wider and softer, and a thick mucous plug seals off the uterus to protect it from infection.
The embryonic period of development has begun and will result in a completely formed baby by the end of your 8th week of pregnancy (counted from the first day of your last menstrual period).
The placenta has begun to form and begins producing the hormones that will prevent a mother's body from rejecting the new pregnancy.
Once the blastocycst implants, cells begin to differentiate. The outer cells reach out like roots to form the placenta and umbilical cord. the inner cells form three layers. One layer will become the brain, nervous system, skin, eyes and ears. Another layer becomes the lungs, stomach and intestinal tract. The third layer becomes the heart, blood, muscles and bones.
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