The normal sleep time for a 4-month-old baby should be about 14-15 hours a day. A 4-month-old baby can basically follow the rule of sleeping at night and being awake during the day, usually sleeping for 2 hours in the morning and 2 hours in the afternoon, and falling asleep at night around 7 or 8 p.m. Generally, the baby eats 1-2 times at night, and it is still recommended to eat once at night for this age. Some babies sleep for a relatively short time, if there are no other abnormal symptoms, all physiological indicators are normal, parents do not need to worry, you can play sleep songs when the baby sleep to help sleep. If the baby’s sleep time is relatively short, accompanied by head sweating, easy to wake up, pillow baldness and other symptoms, may be caused by calcium deficiency, it is recommended to promptly go to the pediatric department of the hospital for examination, clear diagnosis and targeted treatment. After the baby falls asleep, parents should pay attention to observe the child’s sleep in order to keep track of the baby’s physical condition and keep the surrounding environment quiet so as not to affect the baby’s sleep quality.