Sudden screaming and crying after a baby falls asleep may be related to the environment, gastrointestinal discomfort and calcium deficiency: 1. Environment: when the baby sleeps, if the room temperature is too high or the blanket is too thick, the child will appear to yell and cry, parents can see if the baby is sweating, and then check whether there are sharp things in the bedding or other causes of the child’s fear. If these reasons, parents can reduce the cover, adjust the appropriate room temperature, soothe the child, reduce its fear. 2. Gastrointestinal discomfort: bloating, intestinal spasms, the child will also fall asleep suddenly screaming and crying, if this is the case can be taken to massage, hot compresses and other methods of relief. 3. Calcium deficiency: Calcium deficiency in babies can cause increased neural excitability, which can lead to screaming and crying after falling asleep, accompanied by the phenomenon of head shaking. There may be other reasons for the baby to fall asleep and scream, it is recommended that parents take the child to the hospital for a detailed examination, symptomatic treatment. The baby fell asleep suddenly screaming and crying may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, to give targeted treatment or treatment.