Heart defect risk in IVF tied to twinning
A large study backs Australia's move to single-embryo transfers, say researchers
The excess risk of congenital heart defects (CHDs) in ART-assisted pregnancies is accounted for by twinning, according to an analysis of more than half a million pregnancies.
In fact, twins, conceived artificially or not, have nearly five times higher prevalence of a CHD than singletons.
