The causes of bluish color around the mouth of newborns are physiological and pathological, pathological factors such as congenital heart disease, asthma, etc. The treatment includes medication such as vasodilating drugs, surgical treatment and so on. 1. Physiological factors: the skin of the mouth is relatively thin, and may appear cyanotic. When the ambient temperature around the newborn is low, it can lead to vasoconstriction of the blood vessels in the mouth of the newborn, and the phenomenon of bluish color around the mouth occurs. Timely warm measures for the baby, eat warm food symptoms can be relieved. 2. Pathological factors: congenital heart disease leads to a decrease in the oxygen content of the arterial blood, thus causing the symptoms of blue lips. The lack of oxygen during an asthma attack can also cause purple lips. You need to choose drugs under the guidance of your doctor. Parents should pay attention to the newborn’s blue around the mouth, when the child is in discomfort, should immediately go to the hospital.