Know all on IVF
When eggs get fertilised with sperm, egg quality becomes important as this promotes the development of a strong embryo. A quality egg has a better chance of the embryo implanting into the uterus. In simple terms, better-quality eggs make for better-quality embryos and result in successful pregnancies. Having the required amount of chromosomes and their ability to fuse with the sperms are important characteristics of good quality, healthy egg.
It can also be because the egg has no energy to divide post-fertilization and hence cannot survive.