When a child cries at night, we first see if there is a physical cause for the child’s crying, and if there are any pathological causes, such as intestinal cramps, abdominal pain, fever, etc. If these causes are ruled out, we look at whether it is related to the child’s sleep environment and rest time. If these reasons are ruled out, we will see if it is related to the child’s sleep environment and rest time. The first thing is to see if the baby’s sleep environment is suitable, whether the child is hot and sweaty, too cold, or too dry. Children are actually a body than adults are also prone to fever, many times we feel cold, they are not so cold. So sleep at the temperature of the baby, not too hot. Another reason is that too much sleep during the day, so the night is more excited, sleep is not good. This situation should take him to do more activities outdoors during the day and sleep less in order to sleep well at night. At the same time, the bedroom light should also be dimmed, keep the surrounding quiet, so that he slowly learned that he needs to sleep at night, and only during the day can play. The nap time should not be too long. There are also some young babies who go to noisy public places during the day and come back at night to sleep poorly and cause crying. This may be due to the fact that they have seen a lot of strangers during the day or have been frightened by something they are afraid of. So babies who are too young should not go to noisy environments more often. If you can’t find the cause then it’s better to go to the hospital for a checkup.