Babies need to sleep during the day may be related to physiological factors, such as lack of security; may also be related to calcium deficiency, shock and other factors. 1. Physiological factors: the baby due to the age of the month is relatively small, especially newborn babies have not yet adapted to the outside world, the lack of security, so need to sleep in the arms, sleep in the arms of the baby can make the baby feel a sense of security, and is not easy to wake up. 2. Calcium deficiency: baby if the body lacks calcium will also appear above symptoms, but also accompanied by excessive sweating, night terrors, pillow baldness and other adverse phenomena. 3. Frightened: if the baby is frightened by the outside world, he may have a restless sleep, and will return to normal after cuddling. Babies need to sleep during the day may also have other reasons, it is recommended to go to the hospital in a timely manner to carry out relevant examinations to clarify the cause of the disease and actively treat the symptoms.