Nine-month-old babies cry when they don’t move, the possible causes are disease factors, or environmental factors, physiological factors, etc., need to be targeted according to the cause of the treatment. 1. Disease factors: the baby is sick and uncomfortable will cry frequently, such as colds, calcium deficiency. If it is a cold, in addition to crying, there will be nasal congestion, runny nose and other discomforts, you need to take medication under the guidance of the doctor, such as pediatric cold particles. If the crying is caused by calcium deficiency, you can supplement vitamin D and calcium, supplementation for a period of time can alleviate the crying problem. 2. Environmental factors: the environment is noisy, the bedroom light is too bright and other reasons are also easy to cause the baby to cry, you can first improve the environment, and then see if the baby crying problem is alleviated. 3. Physiological factors: baby hunger, wear too thick or too thin, will also feel uncomfortable, parents should learn to observe, in order to understand the baby’s needs, to solve the demand can stop crying. Parents are advised to send their babies who cry frequently to the hospital for examination and treatment after clarifying the cause of the illness to avoid delays.