A child’s fever is only in the upper half of the body, which may be related to poor peripheral circulation and external factors. 1. poor peripheral circulation function: the child fever only upper body fever may be the body temperature has not been stabilized, is still in the rising stage, the child’s peripheral circulation function is not good, will cause the lower half of the body vasoconstriction, the lower limbs of the blood vessels are not as rich as the upper limbs, the appearance of the upper half of the body fever, the lower half of the body does not heat up the situation. 2. External factors: It is also possible that the upper half of the baby’s body wears thicker clothes than the lower half of the body, which will cause the upper half of the body to be hotter. The child’s fever is only fever in the upper body, 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, under the guidance of the doctor’s treatment.