Inside the womb, babies develop through a complex process of cell division and differentiation.
Fertilised eggs implant in the uterine lining and split fast to form a blastocyst, then burrow deeper into the lining before growing into an embryo.
All of the major organs and systems of the body begin to form during the embryonic stage, like the heart, brain, lungs, and digestive system.
The infant grows into a human during the foetal phase, which begins at week 9. The newborn's skin becomes less translucent, and hair and nails grow.
By the end of the pregnancy, the baby is around 20 inches long and weighs about 7 pounds. The baby is ready to leave the womb and experience the world
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