Baby Bad Breath: Common Causes (Milk Residue, Thrush, Infections) and When to See a Doctor

Bad breath in babies has various causes, some harmless, others requiring medical attention:

1. Milk Residue: Post-feeding milk particles promote bacterial growth, causing sour smell; common with formula.
2. Gum Infections: Teething-related gum inflammation.
3. Tongue Coating (Thrush): White fungal coating on tongue.
4. Respiratory Infections: Cold, flu, sore throat cause mucus/congestion-related odor.
5. Dehydration: Dry mouth from insufficient hydration.
6. Certain Foods/Drinks: Onions, garlic, dairy, sugary beverages.
7. Medical Conditions (rare): Gastrointestinal or metabolic disorders.

Consult a healthcare professional if bad breath persists or additional symptoms appear. They can assess cause and advise on oral hygiene or medical intervention.