Babies who love to cry may be due to physiological reasons or may be caused by certain diseases, such as vitamin D deficiency, intestinal spasms and so on. 1. Physiological factors: if the baby is in a state of overfeeding or hunger, or the indoor temperature is too hot, etc., can lead to frequent crying. 2. Pathologic factors: (1) Vitamin D deficiency: if the baby fails to add complementary foods in time or insufficient sunlight exposure, he can be vitamin D deficient, irritability, sleep disturbance, crying at night and other symptoms, and in severe cases, low muscle tone, joint laxity and other signs of delayed motor development. (2) intestinal spasm: the baby in the local cold, gastrointestinal irritation, indigestion and other triggering factors, can cause intestinal spasm, paroxysmal abdominal pain, which causes frequent crying, severe cases of children may also appear pale, vomiting, loss of appetite and other symptoms. Babies love to cry, there may also be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.