The study found that the birth defect rate of IVF is about 9%, and that of naturally conceived infants is about 6.6%. The proportion of eye defects of these two parts of infants is 0.3% and 0.2%, the proportion of cardiac abnormalities is 5% and 3%, and the proportion of reproductive system defects is 1.5% and 1%, respectively. Therefore, it can be explained that the birth defect rate of IVF is higher than that of naturally conceived infants.
The statement 'The parents of IVF are much older than those of naturally conceived infants. The older the parents are, the higher the rate of neonatal birth defects is' questions this conclusion most.