Why IVF is smarter?

This is a misunderstanding. IVF is the same as a naturally conceived baby. They were all born after their mother conceived in October. The only difference is that IVF needs to take out sperm and eggs first, stay in a test tube in the laboratory for a period of time, and then transplant them back to the mother's uterus after they develop into embryos. Now the third generation technology can also screen embryos with genetic disease genes to ensure the transplantation of healthy embryos, so the pregnancy rate of IVF will be much higher than that of natural pregnancy.