Babies usually do not have bad odor coming out of their mouth and usually have a sweet breath. Though this is generally true, even babies and small children can have bad breath.

One common type of bad odor is one associated with throat and mouth infections, a foul smell mothers recognize better than men.

Very young children often sport a bad smell from the back of their tongues. Bad dental hygiene is another cause for bad breath in young kids and teenaged children, as they cannot clean their tongue to the deepest point possible. Curing bad breath in children is difficult owing to sensitive tongue and gums.