Baby frequently waking up at night crying may be sleep environment discomfort, lack of calcium, dietary factors, etc., can be changed through the sleep environment, supplemental vitamin D and calcium, dietary adjustments and other methods to solve. 1. Sleep environment discomfort: baby frequently waking up at night crying, may be too high or too low indoor temperature, or quilt cover too thick, the child feels uncomfortable, stomp off the quilt and then cold stomach bloating caused by abdominal pain and discomfort. Parents should create a comfortable sleeping environment for the baby, do not disturb the baby when sleeping. 2. lack of calcium: this symptom may also be the baby lack of vitamin D and calcium caused by the child’s rapid growth rate, calcium deficiency may cause the nervous system is too excited, resulting in frequent crying, diagnosis can be appropriate to give the child to take vitamin D and calcium, more sunshine to promote the absorption of calcium, can improve the quality of sleep. 3. Dietary reasons: babies are sometimes not fed enough, frequently waking up at night hungry, or feeding too much to cause indigestion, food accumulation, can cause frequent waking up at night. For insufficient feeding, to gradually increase the child’s feeding amount, and for children with food accumulation, to reduce the child’s feeding amount appropriately. Frequent waking up at night and crying may also be other reasons, if necessary, parents should take the baby to the doctor to identify the cause, and targeted treatment, so as not to delay the condition. To use drugs under the guidance of the doctor, avoid unauthorized use of drugs.