Common causes of poor sleep are: (1) improper breastfeeding, too much food before bedtime to increase the burden on the intestines, easily lead to indigestion; (2) poor environment, noisy surroundings or clothing wrapped too tightly; (3) lack of security, parents are not around or in an unfamiliar environment to sleep, the baby lack of security easy to wake up; (4) mental stimulation, when the child is frightened during the day, emotional ups and downs. (5) calcium deficiency, vitamin D, etc. will also affect the baby’s sleep at night. In order to improve the baby’s poor sleep state, parents can pay attention to the following points. (1) The amount of breastfeeding before bedtime should be appropriate. Before going to bed or when the baby wakes up for the first time, it is important to feed the baby but not too much. (2) Provide a quiet and comfortable sleeping environment for the baby. (3) Put your hand on your baby or pat your baby’s back or bottom rhythmically, and then slowly move away after your baby is asleep. (4) Use a bassinet or a crib that rocks. (5) Wear cotton pajamas for your baby and don’t cover your child with too thick a blanket when you sleep. Children are generally afraid of heat, and children sweating a lot will also affect sleep. In short, poor sleep is not always a problem of sleep habits, sometimes poor sleep is related to disease. If your child still has frequent sleep problems despite all of the above, you need to take your child to the doctor to determine if there is a disease.