Why does my baby start to have bad breath?

When a baby develops bad breath, it is a health signal that parents should pay attention to, as it may involve various underlying causes. 1. **Oral hygiene**: Although infants do not need to brush their teeth, residual food or milk remaining in the mouth can harbor bacteria, leading to bad breath. Parents should regularly clean their baby's mouth to maintain oral hygiene. 2. **Digestive system issues**: Conditions such as indigestion or constipation can cause food to remain in the gastrointestinal tract for too long, producing foul-smelling gases that are expelled through the mouth. Adjusting the baby's diet to improve digestion may be necessary. 3. **Medical conditions**: Certain oral or systemic diseases, such as oral ulcers or respiratory tract infections, may also cause bad breath. Parents should closely monitor their baby's condition and promptly identify the underlying cause. If parents notice persistent bad breath in their baby or if it is accompanied by other symptoms such as refusal to eat or fever, they should seek timely medical attention for proper diagnosis and treatment by a healthcare professional.