There are two causes of baby screaming: physiologic and pathologic factors, and most small children are expressing their emotions. Pathological factors are mostly caused by craniocerebral diseases. Physiological factors of screaming in small children are mostly due to the expression of their emotions. 0~3 years old children have imperfect language expression ability and will express their thoughts by screaming. However, if a child aged 3~14 years old appears to be screaming, it should be a way to express his/her anger when his/her needs are not met. Newborn babies with craniocerebral injuries caused by bilirubin encephalopathy or ischemic hypoxic encephalopathy can lead to screaming and lethargy, and it is important to go to the hospital in a timely manner according to their condition to give targeted treatment to prevent the occurrence of after-effects. Baby screaming may also have other reasons, it is recommended to go to the hospital in time, complete the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.