3 months baby body temperature 37.8 ℃, if the quiet state of the axillary surface temperature, consider it is not normal, consider hypothermia; if it is the mouth surface, anal surface temperature, or there is eating and crying and other factors affecting, consider it normal. Children’s normal axillary body temperature range of 36.0 ~ 37.4 ℃, generally used 37.5 ~ 38 ℃ for hypothermia, if the measurement site for the armpit, the temperature of 37.8 ℃, is abnormal, need to be considered as a febrile state. Normal oral surface, anal surface temperature will be slightly higher than the axillary surface temperature, there are 0.3 ~ 0.5 ℃ fluctuations, the temperature is below 37.9 ℃ is normal, so the measurement of the oral cavity, the anus within the body temperature of 37.8 ℃, consider it normal. However, the baby’s body temperature, may also be subject to diet, strenuous exercise, crying, wearing too thick clothing, high room temperature, emotional excitement and other temporary increase, but also need to be combined with other symptoms to diagnose the disease. Considering that your baby’s temperature is elevated, try to take your child to the hospital for a checkup to confirm the diagnosis before treatment.