Common causes of night crying in children include colic, shock, calcium deficiency, etc. It is recommended that regular hospitals make a diagnosis to rule out other hidden diseases. 1. Colic. Infants and young children gastrointestinal tract development is not perfect, easy to intestinal flatulence, intestinal colic, etc., mostly physiological, may cause pediatric night crying, can clockwise massage abdomen to help relieve. If not relieved, we should be alert to intestinal obstruction, intussusception and other phenomena, need to consult a doctor in a timely manner, if necessary, surgical treatment and so on. 2. Frightened. If the daily baby is frightened, lack of security, the cerebral cortex is active at night, infants and young children will wake up due to dreaming, thus crying. You can give your baby a gentle caress to ease the baby’s anxiety and create a quiet and comfortable sleeping environment for your baby. 3. Calcium deficiency. Vitamin D deficiency will affect the absorption of calcium, which will lead to muscle twitching and night crying. Normally, you should pay attention to more sunshine and take vitamin D supplements under the guidance of your doctor. There may also be other reasons for night crying, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.