As women age, the risk of chromosomal abnormalities in embryos increases, which may lead to issues such as fetal stasis, miscarriage, preterm birth, or congenital malformations. To avoid these situations, IVF doctors typically perform genetic screening using PGS/PGD technology when the embryo develops into a blastocyst on the fifth day. This testing can check for abnormalities in the 23 pairs of chromosomes and screen for 274 genetic diseases. Through this method, doctors can select the healthiest blastocyst for implantation, ensuring the baby’s health at a genetic level.