When a newborn baby sleeps, the sound of heavy breathing is seen in the following cases: 1, the nasal cavity of this newborn baby is narrower, narrower airway, especially when the newborn baby lies flat, it will be more obvious, but heavy breathing should not have a runny nose or other secretions, consider that it may be caused by the child’s narrower airway. 2, adenoid hypertrophy, mainly to check the CT of the nasopharynx to clarify the diagnosis. 3, may be atypical laryngeal chondrodysplasia, especially when the mother is pregnant with calcium deficiency, such as calf cramps. It may be atypical laryngeal chondrodysplasia, especially when the mother has calcium deficiency during pregnancy, such as calf cramps, etc. The child can be given calcium supplements and vitamin AD, which may also disappear naturally with time, about 6 months after birth.