Babies in the air conditioning room nose is not ventilated to pay attention to two situations: the first case, to consider that the child may be in a state of hypersensitivity, and the dust cover in the air conditioning dust, mold and so on, is an important allergen, may cause the baby’s nasal mucosa congestion and other symptoms of allergy, resulting in the nose is not ventilated, this situation should be given to the child to change a room, open the window ventilation. If the nose is clear, it does not matter. If the nose is still not clear, you can take appropriate anti-allergy drugs, such as cetirizine hydrochloride or loratadine, etc. In the second case, we should pay attention to the fact that infants, because their thermoregulatory center is not yet perfect, are easily affected by external environmental factors and have a cold and flu. Then this situation is mainly symptomatic treatment, you can buy saline nasal spray to clean the nasal secretions, you can take appropriate anti-allergy drugs, you can also take anti-viral oral solution and so on.