Of course, infants may also catch a cold, and the chances of catching a cold are more than that of older children and adults. Infants have poor immunity and resistance to organ dysfunction, and the immunity of the respiratory system and digestive system is relatively poor, so they are easily affected by external environmental factors. If there are viruses and bacteria in the environmental factors, poor resistance, especially when the temperature difference is relatively large, or there are adults who carry infections in contact with infants, it is very likely that they will also be infected with viruses that cause cold symptoms. Once the cold symptoms may be heavier than older children and adults, the risk is greater, easy to secondary new infections, such as viral colds are easy to secondary new bacterial infections, etc., so must pay attention to.