Babies cry every night, may be related to physiological factors, may also be due to vitamin D deficiency rickets, eczema and other causes. 1. Physiological factors: Commonly found in younger babies, who are unable to express their wishes through language because they can’t speak yet. In the night due to indoor temperature is too high, too low, or stomach hunger and other factors, resulting in physical discomfort, it may appear every night crying phenomenon. 2. Vitamin D deficiency rickets: this disease can lead to increased neural excitability of the child, resulting in restless sleep, which may cause frequent waking up at night and crying, resulting in crying every night, which may also be accompanied by excessive sweating, occipital baldness and other symptoms. 3. eczema: common in the hot summer, because the weather is too hot, the baby stayed in the hot and humid environment for a long time, easy to cause eczema, resulting in more local skin pinpoint-sized pimples, pimples, resulting in localized skin itching, pain, may appear every night crying phenomenon. Baby crying every night, may also be caused by other reasons, parents should promptly find the cause, if necessary, need to take the baby as soon as possible to see a doctor, a clear diagnosis of the cause, by the doctor’s guidance for treatment.