Because of immature organ function and imperfect thermoregulation center, infants are susceptible to external environmental factors that make their body temperature unstable and prone to illness. If the weather is hot or cold, stay in the air conditioning room than not blowing air conditioning is certainly more suitable for infants, because the appropriate temperature for the growth of infants, to prevent infants from getting sick is very good. Air conditioning because there is a dust cover, anti-layer cover inside the dust, mites, mold, etc. The dust cover must be cleaned regularly so that children are not prone to allergies and illness. Air conditioners should be ventilated every day, 2-3 times a day, for more than 30 minutes each time, in order to keep the indoor air fresh so as to avoid secondary infections in infants.