A body temperature of 34.9℃ is hypothermia, which is abnormal. Because the axillary temperature in childhood is generally 36-37 ℃ is the normal body temperature, ear and anus temperature than the axillary temperature is 0.5 ℃ higher than the normal temperature, so it is low body temperature. If the newborn appears this body temperature is considered to be due to the neonatal thermoregulation center is not perfect, so if the environmental temperature is low, can also appear low body temperature, of course, does not exclude the infection is particularly serious caused by the body temperature does not rise. If it is an older child, it may be the extreme stage of the disease or the recovery stage. The extreme stage is caused by the weakness of the body caused by sweating after high fever, and the recovery stage is still related to the weakness of the child, of course, also related to the weakness of the body after sweating, and improper heat preservation. In this case, it is recommended to go to the pediatrician for an interview, because the temperature is too low and needs to be rewarmed.