Almost 11 month old has bad breath. ?

Could be...: ...infected tonsils/adenoids, failure to properly clean gums, GI disturbance, metabolic imbalance, baby bottle syndrome, reaction to Meds, etc. See BOTH a Pediatrician (a kids medical specialist) and a Pedodontist (a kids dental specialist. "Bad breath" should not be ignored, may be symptomatic of potentially serious problem.

Child's bad breath: In the majority of cases, the cause of bad breath or halitosis, poor oral hygiene, dry mouth or may be a sign of other serious health problems (chronic sinus). See your pediatrician for eval and bad breath management that depends on its cause.