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Test tube babies are fertilized in test tubes.It is known as IVF(in vitro fertilization). In this process the doctors collect egg(ovum) from the mother and the sperms(spermatozoon) from the fathers. They they keep it in the test tube for few hours to fertilize.Then they are implemented back into the uterus where the baby to grows till 9 months.
Test tube babies are babies that are created in a test tube by taking one sperm cell and one egg cell and combining them. So the baby starts to develop in the test tube and is then implanted into the mothers uterus.