An embryo is developing in the womb of its mother. In the first few weeks, it is nourished by the yolk sac, but after 8 weeks the umbilical cord takes over to provide nutrients from the mother's body. Throughout gestation, the embryo's limbs, eyes, and facial features develop. By 24 weeks, it can move its arms and legs and suck its fingers. In 40 weeks, the single cell has transformed into a fully formed baby, ready for birth. The miracle of forming human life in the womb is almost complete.