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Well babies are caused by having intercourse with the opposite sex. The female can supplies an egg and the man have the sperm. When combined the egg is fertilized and begins growth.
Either by sexual intercourse between a male and a female, or by artificial insemination, a female may become pregnant. The actual pregnancy occurs when a fertilized egg (called an embryo) attaches itself successfully to the inner lining of a the female's uterus and starts to develop into a fetus. Gestation period depends upon the species, however humans gestational period tends to last around 9 months (give or take a few weeks). When the fetus is then birthed, it is called a baby. In the case of marsupials (kangaroos, koalas), gestation is very short, about a couple of weeks. Then the embryo moves from the uterus to the pouch where it then attaches itself to a teat for nourishment and develops into a fetus, then an infant.
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