The common causes of purple fingernails in newborn babies may be the following: 1. It is possible that the local nail cyanosis is caused by insufficient local warmth and poor peripheral circulation, which will gradually ease after warmth. 2. Whether some respiratory diseases cause hypoxia, resulting in purple nail beds, which may be accompanied by respiratory symptoms, such as moaning, foaming, shortness of breath, etc., treat the baby If you have a newborn baby with a purple nail bed, you need to pay attention to congenital cyanotic heart disease, you need to improve the cardiac ultrasound examination to further clarify, the conventional oxygen can not completely relieve the purple finger nails, if necessary, you need to choose the right time to carry out surgery.