The baby wakes up at 5 am every day, which may be related to physiological factors, or may be caused by infantile colic, vitamin D deficiency rickets and other reasons. 1. Physiological factors: If it is the period of breastfeeding small babies wake up at 5:00 am every day, most of the consideration may be due to stomach hunger, urination, defecation, resulting in discomfort caused by. If it is a larger baby, it may be due to sleep too early at night, to 5:00 in the morning sleep has been enough to wake up naturally. 2. Infantile colic: infantile colic occurs in the evening or early morning, if the baby wakes up at 5:00 am every day, and is accompanied by crying, pale around the mouth, facial flushing and other manifestations, consider that it may be due to infantile colic. 3. Vitamin D deficiency rickets: If the baby suffers from vitamin D deficiency rickets, resulting in increased neural excitability, it may show more than 5:00 a.m. every day to wake up, but also can be accompanied by difficulty in falling asleep, head sweating, dreamy sleep, easy to wake up and other manifestations. The baby wakes up at 5:00 am every day, may also be caused by other reasons, if accompanied by obvious discomfort symptoms, it is recommended to seek medical attention as soon as possible, after a clear diagnosis of the cause, to give targeted treatment and conditioning.