Noisy breathing is very common in children. It usually happens when there is some kind of blockage or narrowing of the airways. The most common cause of this is a cold, which will often cause snuffling or wheezing sounds. If it only happens occasionally, when your child has a blocked nose, then noisy breathing isn’t usually anything to worry about. However, if it happens often, isn’t linked to a cold, or sounds very bad then you should see a doctor. Noisy breathing can sometimes be a sign of something more serious in children.