I think it is not true. The health of our kids depends on how we take care of them. Giving vitamins and breastfeeding will give your baby a defense against diseases.
That's because it involves hormonal stimulation, fertilisation outside the human body and culturing the embryo for a couple of days before it's transferred to the uterus. It's already well recognised that IVF-conceived babies are at an increased risk of preterm birth and lower birth weight than other children.