Male babies with precocious puberty may show early testicular development and have pubic hair, armpit hair, voice change, etc. Female babies may show breast development and have pubic hair, armpit hair and menstruation. Female babies who develop secondary sexual characteristics before the age of 8 and male babies before the age of 9 are considered to have precocious puberty, and both male and female babies show different symptoms. Male babies are mainly characterized by testicular development, the appearance of pubic hair and armpit hair, and the beginning of voice change, while female babies are mainly characterized by breast swelling and pain, the development of armpit hair and menstruation at the same time. Parents in the discovery of the baby has the above symptoms, it is necessary to go to the hospital in time to carry out relevant examinations, clear the cause of the disease and then actively treat the symptoms, to avoid the baby to appear precocious puberty is not conducive to the development of height and body.