Pregnancy Videos & Photos - The Fourth Month
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Brought to you by Nine Months To Birth The placental membrane allows exchanges to occur more freely between mother and fetus. The fetus grows, becomes more human-looking and tends to become more independent. The placenta: a more permeable barrier. The placenta is now entirely functional. It takes up 20 to 25% of the area of the uterus. From the 6th month of development, it has completely replaced the corpus luteum by secreting more and more hormones; in this way, it provides mother and fetus with more estrogen and progesterone, a capacity that is specific for human beings. The fetus is now less sensitive to harmful substances than the embryo was. |
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Pregnancy Video: Weeks 13-16 (4th Month) |
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