Fever as soon as the baby goes to sleep may be caused by infection or too thick a blanket. Fever caused by bacterial virus or mycoplasma infection and other factors, when the baby sleeps after the vagus nerve excitability decreases, the ability to regulate body temperature becomes poor, so it is easy to appear fever. Of course may also be accompanied by sore throat, nasal congestion, runny nose, cough and diarrhea and other symptoms. It is necessary to take the baby to the hospital in time to find out the cause and give symptomatic medication in time. If the baby has a deficiency of yin and fire, sleeping under the covers more, so that the body’s heat can not be dissipated is also easy to cause fever, it is recommended to give the baby to measure the temperature before loosening the clothing, 10 minutes later to measure.