During the process of eruption of baby teeth, the gum area may easily become red, swollen or some children may have drooling, which may be the cause of crying. How long it lasts depends on whether the redness and swelling of the gums has recovered. If it has recovered and the child still cries, parents should find the cause because there are many reasons for children to cry at night, such as heavy internal fire and dry stools, and the child has not had a bowel movement for several days. Some children may have allergies, itchy bodies or wear more clothes. Other children may depend on their parents at night. Sometimes changes in sleep habits and sleep environment may also cause children to cry at night, so parents need to make a specific analysis.