Clinical causes of very red baby lips are as follows: 1, environmental factors, if the baby is located in the environment temperature is too high, or the baby is overdressed, covered too thick, resulting in increased body heat gathered, resulting in capillary expansion, the phenomenon of red lips. 2, the baby is on fire, if the baby’s lips are red at the same time accompanied by bad taste in the mouth, loss of appetite, bloating, constipation, eye boogers, and at night, the baby is on fire. 3, fever, baby fever will also appear lips very red symptoms, accompanied by increased breathing, poor mental health, love to toss and turn. Sleeping is not stable, always tossing and turning, consider the baby on fire. 3, fever, the baby fever will also appear very red lips, accompanied by breathing faster, poor mental state, crying and other symptoms, parents are advised to measure the baby’s body temperature. If the fever, according to the temperature rise, give physical cooling or drug cooling treatment, to prevent the occurrence of febrile convulsions.