The baby seven months frequently waking up at night crying may be physiological factors, may also be the manifestation of certain diseases, such as vitamin D deficiency, indigestion, etc., should be timely consultation to find out the cause of the disease. 1. physiological factors: if the baby does not eat enough, or wet diapers, can also cause frequent waking up crying. 2. Pathologic factors: (1) lack of vitamin D: when the seven-month-old baby’s body lacks vitamin D and so on, it will lead to the lowering of the blood calcium in the body, causing the excitability of the nerves to increase, which will cause the symptoms of the seven-month-old baby waking up at night with frequent crying. (2) indigestion: due to the baby’s age is still small, their own digestive system is not fully developed, easy to produce indigestion. Indigestion can cause the baby to experience bloating, abdominal pain and other uncomfortable symptoms, it will lead to 7-month-old baby waking up frequently crying at night. This symptom alone is not enough to diagnose the disease, there may be other factors that cause it. It is recommended that the patient consult a doctor to clarify the cause of the disease and give targeted treatment.