Seven-month-old babies waking up frequently at night may be due to environmental factors, dietary factors, calcium deficiency and other reasons. 1. Environmental factors: If the environment is too noisy, the indoor temperature is relatively high, and the bedding is too thick, it will lead to the child’s physical discomfort and cause the baby to wake up frequently at night. 2. Dietary factors: if the baby before going to sleep, too much food, will cause gastrointestinal dysfunction, indigestion, food accumulation, etc., which will lead to abdominal pain, abdominal distension and other symptoms, resulting in the baby’s frequent waking at night. 3. Calcium deficiency: seven-month-old babies frequently wake up at night may be caused by calcium deficiency, when the body lacks calcium, the baby’s nerve excitability increases, which causes such a situation. If the situation persists for a long time, it is recommended that parents lead their children to the regular hospital in time, under the guidance of the doctor, relevant examinations, according to the specific results of the examination, to take targeted treatment.