Babies with Congenital Heart Defect is commonly called "blue baby". This is because when the baby cries, the baby turns blue (because of the lack of oxygen in the blood). No, Congenital Heart Defect is not new. It is not caused by modernization and chemicals in our food. Until now, there is no study that could pinpoint exactly what causes it. The condition existed even in olden times. It was just not being talked about. There was also no way of healing it.