Baby simple fever, may be due to toddler emergency rash, weather factors, etc., as follows: 1, toddler emergency rash: when the baby does not appear other symptoms suddenly fever, may be due to toddler emergency rash, when the fever subsides after the body will be a rash, usually within a few days will be back to normal, do not need special treatment, if the fever has been not receded, you can carry out the physical fever, with warm water to wipe the armpits, feet, palms and so on; 2.Weather factors: If the weather is relatively hot, the indoor temperature is relatively high, but eating and sleeping normally, it means that the fever is caused by the weather, in this case, drink more water, adjust the indoor temperature, usually will recover well on its own; 3.Other: it may be due to too much to wear, drink less water caused by simple fever, this time, we need to reduce the number of clothes to wear, and drink more lukewarm water can be. If the baby in addition to fever, but also mental state is not good or accompanied by other symptoms, to consult a doctor in time.