Three months old baby sneezing and runny nose, that is definitely a cold, are caused by improper care or contact with family members who have a cold, it is recommended to keep warm. If the baby is generally doing well, it can be improved by eating more milk and drinking more water. Because colds are self-limiting illnesses, they can get better in about a week and vary in severity. If the case is very mild, there are few cold medicines suitable for such a small baby itself, so try your best not to take medicine to improve. If the baby’s general condition is very poor, such as irritable crying, appetite significantly decreased, that is, the amount of milk eaten significantly reduced, then it is necessary to take cold medicine. You should also observe the changes in the baby’s temperature and cough. If there is a fever and a cough, you need to be alert to the fact that the condition has progressed to bronchitis after a cold, and you need to see a doctor.