6-month-old babies do not sleep with hunger, poor sleep habits and other physiological factors, but also may be related to vitamin D deficiency rickets or other diseases. 1. Physiological factors: 6-month-old babies do not sleep may be related to hunger, poor sleeping habits, frightened, poor sleep environment and other physiological factors, usually not accompanied by other uncomfortable symptoms. 2. Vitamin D deficiency rickets: Vitamin D deficiency rickets is caused by the body’s lack of vitamin D. It can be caused by insufficient sunlight, fast growth rate, improper diet and so on. The common symptoms of children with night terrors, irritability, irritability, excessive sweating, X-shaped legs, etc., and some babies with serious conditions may not sleep. 3. other diseases: acute gastroenteritis, hydrocephalus, meningitis, mumps, intestinal obstruction and so on may cause 6 months baby does not sleep. 6 months baby does not sleep, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.