IVF is an in vitro fertilization-embryo transfer (IVF) technique in which the egg and sperm are removed, fertilized in a laboratory, cultured until the second, third or fifth day, depending on the embryo, and then transferred into the uterus to continue development. The development after transfer into the body is no different from that of a natural pregnancy. It is currently the most widely used assisted reproductive technology in the world. Time concept of IVF: IVF is the name everyone uses for a baby born through assisted reproductive technology. This baby is actually inside the mother from conception until delivery, and grows for only the first two days in a test tube or flat dish. The science of IVF: A normally born baby develops from the union of sperm and egg in the woman’s body. If we collect normal sperm and egg, can they combine and develop in some laboratory conditions outside the body? Scientists have done this by simulating a similar environment for survival, completing the fertilization process in a test tube, and then transferring the early embryo back to the mother, but still waiting to see if a pregnancy occurs. Technological advances in IVF: We have evolved from a time when sperm and eggs were placed in the same test tube waiting to unite to a time when sperm can be injected into the cytoplasm of the oocyte under a microscope by microinjection techniques to complete fertilization, a seemingly small process that is a huge advance. Originally used to treat infertility caused by blocked fallopian tubes, in vitro fertilization has been found to be helpful for infertility due to endometriosis, abnormal sperm (abnormal number or morphology), and even unexplained infertility. Studies have shown a pregnancy rate of around 40% after one cycle of treatment.