5-month-old babies are relatively young and have poor resistance and are prone to colds and fever, so blowing fans is not recommended. If the weather is hot, you can use the fan appropriately to help air circulation, however, do not let the child blow against the fan, you can let the fan from the side or let the fan blow towards the wall, through the flow of air to help the child cool down, the child will also feel more comfortable. In addition, the child can use the air conditioning, you can lower the air conditioning temperature appropriately, generally maintained at about 26 ℃, but, the air conditioning vents can not be blowing against the child, otherwise the same will cause a cold. When using air conditioning, pay attention to the room to open the window often, so that the circulation of air, the child’s body is good.