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Human embryology is amazing.
Two microscopic cells come together. Within three weeks, those cells have formed a foetal mass with a heart beat. By two months parts are starting to distinguish themselves, limb buds, head, face, eyes, etc. By the fourth month the fetus is visably human including visibly distinct gender, albeit the proportions are still working out and organs are developing. Fetal urine is the amniotic fluid that is inhaled to develop the lungs and swallowed. By the start of the third trimester, the fetus is developed enough it is possible although difficult to survive. By the seventh month the survival rate has vastly improved, and at the eighth month, the baby is basically developed and survivable, but hangs on another month for good measure. Amazing stuff!
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