A baby is born when the father’s sperm unites with the mother’s egg to form a fertilized egg, which then develops in the mother’s uterus. The baby inherits half of the DNA from each parent, and then absorbs nutrients from the mother through the placenta and gradually develops and grows up. The baby is initially a fertilized egg formed by the union of the father’s sperm and the mother’s egg. The fertilized egg is just a single cell, which then divides by mitosis to form a mulberry embryo, which then continues to divide by mitosis and enters the mother’s uterine cavity where it will be deposited, after which the gestational sac will gradually develop structures such as the yolk sac, the heart of the foetus and the foetal buds, which will ultimately form a foetus. A baby develops from a fertilized egg, which is a combination of a sperm and an egg. The sperm contains genetic material from the father and the egg contains genetic material from the mother, so the baby inherits half of the DNA from each parent and is conceived in the mother’s uterus.