Some parents may inadvertently find that their children’s lips are purple, and there are many reasons why a child’s lips may be purple. Sometimes the child will be due to some problems in the respiratory system, so that the child is not breathing well, so that the body has a serious lack of oxygen, so that the child’s normal respiration is impeded, then there will be a sudden purple lips, so parents need to pay close attention to the usual. If the child has purple lips at birth, it is most likely due to congenital heart disease. If the child has no symptoms in the early stages and develops purple lips in the later stages, accompanied by pneumonia and other infections, the child may be suffering from hypoxemia, and some children may even suffer from respiratory failure, so it is important to seek medical attention as soon as possible to determine the cause of the disease and to treat it as soon as possible.