7 months baby sleep head sweat usually consider there are physiological reasons, and vitamin D deficiency rickets and so on. 7 months baby nervous system development is not perfect, autonomic function coordination is not stable, and the metabolism is relatively fast, coupled with the head of the sweat glands are more developed, in the sleep period will show more sweating, but also may be wrapped too thick, the environment temperature is too high to cause. Vitamin D deficiency rickets, is also a common cause of babies sleep head sweat, will be accompanied by irritability, irritability, difficulty in falling asleep, easy to wake up at night, etc., the serious will also appear square skull, rib edges turned out and other skeletal abnormalities, jeopardizing the growth and development of the baby. 7 months baby sleep head sweat, there may be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, give targeted treatment or treatment.