6 months baby sleep head sweat may be a normal physiological phenomenon, but may also be too high temperature, iron deficiency anemia and other causes. 1. Normal physiological phenomenon: due to the 6-month-old baby’s nervous system development is not yet perfect, the body’s metabolic rate is faster, higher basal metabolic value, there may be a sleeping head sweating phenomenon, especially shortly after falling asleep, sweating more. 2. high temperature: 6 months baby sleep when the environment temperature is too high, may lead to sleep head sweating phenomenon. 3. Iron deficiency anemia: 6 months baby if there is iron deficiency anemia, the blood in the blood red blood cell content is reduced, the ability of the blood to carry oxygen is weakened, resulting in the brain is in a state of chronic hypoxia, leading to physical weakness, fatigue, may appear to sleep head sweating phenomenon. 6 months baby sleep head sweat may also have other reasons, it is recommended to go to the hospital, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.