Babies born through assisted reproductive technology, such as in vitro fertilisation (IVF), may have a 36 per cent higher risk of developing major heart defects compared to those conceived naturally, a new study has found. Researchers analysed data from over 7.7 million live births across four Nordic countries: Denmark, Finland, Norway, and Sweden over three decades. They looked for diagnoses of a serious heart defect either while the baby was in the womb or during their first year of life. Researchers compared the occurrence of major heart defects in babies conceived naturally versus those bo…