Seven-month-old babies crying in their sleep is related to temperature discomfort, shock, illness or calcium deficiency, etc. Appropriate improvement of indoor temperature, calcium supplementation, disease caused by the need for timely medical attention. 1. temperature discomfort: indoor temperature is too hot or too cold, cover too much, seven months baby in sleep irritable, kicking the blanket cold, will lead to baby crying. 2. Fright: When the seven-month-old baby suddenly frightened or fight during the day, or see the frightened things, can cause the baby to cry in the middle of the night. 3. Disease: seven-month-old baby sick night aggravation, can cause general discomfort, crying in the middle of the night. Should be consulted as soon as possible, as soon as possible to shorten the course of the disease, relieve the baby discomfort. 4. Calcium deficiency: calcium deficiency in the body of seven-month-old babies can lead to increased neural excitability, manifested as irritability, excessive sweating, hyperactivity, especially sleep is not solid, easy to wake up after sleep and crying. If necessary, vitamin D and calcium supplements should be taken in time. If the seven-month-old baby appears to cry at night for a long time, parents should pay attention to the phenomenon, and consult the doctor in time.