A baby’s temperature of 35.5 degrees is not a fever, it is hypothermia or a temperature that does not rise. In terms of treatment, the first thing to do is to pay attention to the baby’s mental state. If the baby’s mental state is good or the environmental temperature is too low, you can raise the ambient temperature of the baby’s environment by increasing the clothes the baby wears, and then retest the temperature after observing for half an hour to one hour. If the temperature rises above 36 degrees, you can continue to observe. If your baby is not in good spirits or if your baby’s temperature is still less than 36 degrees in half an hour to an hour after you increase the clothing and raise the ambient temperature, you should take your baby to the hospital and ask the doctor to help you find the cause of your baby’s hypothermia.