The back of the head of the newborn baby is very hot may be caused by physiological factors such as hot weather, or pathological factors such as colds. 1. Physiological factors. Due to the hot weather, newborns wear too much, causing sweating, thus the phenomenon of the back of the head is hot. Newborns are in the flat state every day, in the hot weather, the head and pillow has been attached to the pillow, easy to sweat, resulting in the phenomenon of hot back of the head. Some newborns will also experience heat in the back of the head when they are irritable. 2. Pathologic factors. Due to cold, bacterial infection and other reasons, causing cold and fever, which leads to the back of the head hot. Newborns are hot at the back of the head, there may also 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.