07/07/2026
A bedtime bottle may seem comforting, but it can quietly damage a child's teeth while they sleep.
A recent Australian cohort study found that children who were bottle-fed to sleep beyond 12 months had a higher risk of developing early childhood tooth decay. Researchers also observed a higher likelihood of overweight among children who continued this bedtime feeding habit.
During sleep, saliva production naturally decreases, reducing the mouth's ability to wash away sugars and neutralize acids. When a bottle remains in the mouth as a child falls asleep, bacteria can feed on these sugars for prolonged periods, leading to repeated acid attacks on developing teeth.
This doesn't mean parents should stop meeting their child's nutritional needs. Instead, experts encourage gradually transitioning away from bedtime bottles after infancy, offering water instead of milk or sweetened drinks at bedtime when appropriate, and cleaning the child's teeth before sleep as soon as the first tooth erupts. Small changes in bedtime routines can help protect both oral and overall health during early childhood.
📄Reference study: Cheng H, John J, Scott J, et al. Bottle feeding to sleep beyond 12 months is associated with higher risk of tooth decay and overweight in Australian children: Findings from the Healthy Smiles Healthy Kids cohort study. Australian and New Zealand Journal of Public Health. 2025;49(2):100224.
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