Six-month-old baby 35.5 ℃ belongs to the body temperature is low, considering that the warmth measures are not done properly or due to measurement error. Normal underarm body temperature in 36 ~ 37 ℃, due to the age of the child is small, the body temperature will be higher than adults, but will not appear 35.5 ℃ this situation. Six-month-old baby 35.5 ℃ suggests that the body temperature is low, may not give the baby good warm measures, such as bedding is too thin, the environment temperature is too low. If the baby’s spirit is normal and there are no uncomfortable symptoms, it may also be caused by the wrong measurement results, such as the thermometer is damaged, the time to measure the temperature is too short, and so on. Parents are advised to give their babies some warm water, turn on the heater if the indoor temperature is too low, add clothes to the baby appropriately and strengthen the warmth measures. After a period of time to re-measure the baby’s body temperature, to observe any changes in body temperature. If the temperature is normal, at 36-37 ℃, there is no need to be too nervous. If the body temperature is still low, it is recommended to take the baby to the hospital for relevant examinations to rule out other causes.