Test tube babies are produced by combining the egg and the sperm in a culture tube (In-vitro Fertilisation) and taking care of the uterus are called test-tube babies. They are just the same as normal babies; only the procedure takes place in In-vitro conditions. Test tube babies don’t grow entirely outside of the body, they just get conceived in a culture tube. When an embryo is formed with the help of a sperm and egg, it is transferred into a woman’s functional uterus where the baby grows.