If a newborn baby’s lips turn purple when he cries, consider that it is caused by the following reasons: 1. Physiological hypoxia causes. As the child cries very violently, the lung ventilation function will be temporarily inhibited, the child’s blood oxygen degree will drop significantly, the situation of purple lips. This is a temporary physiological phenomenon and parents need not worry too much. This type of child is characterized by the usual symptoms as well as lips are very good, the mouth and lips are very red, and the mental state is also relatively good. 2, congenital heart disease caused. If the child’s congenital heart disease is not particularly obvious, usually there is no purple lips, after crying the lips appear blue, this belongs to the temporary cyanotic purpura. Parents should evaluate the child’s situation and can give the child interventional treatment of cardiac catheterization.