Normally, when clapping, full-term babies can hear sounds. Newborns can hear sounds at birth, but their response to sounds is slightly delayed. After the full moon, hearing will further develop, at this time, if there is a sound issued, such as clapping hands, talking loudly, the baby will hear the sound, and turn his head to the direction of the source of the sound, make a search for the source of the sound, and judge the direction of the source of the sound. If clapping hands, full-term babies do not respond to the sound, there is no action to find the direction of the sound source, or slow response, there may be hearing abnormalities, parents should be vigilant. It is recommended to visit the hospital in time for hearing screening and other tests to clarify whether there is a hearing problem. If diagnosed, early intervention should be made.