How Prolonged and Night-Time Bottle-Feeding Relates to Early Childhood Caries

Early childhood caries (ECC)—a term used to describe tooth decay in young children—remains a major public health challenge worldwide. Infant feeding habits, such as how long a child uses a bottle and whether they use it at night, are often blamed as potential risk factors. However, past research has shown inconsistent results regarding exact timeframes. A recently published systematic review set out to evaluate whether prolonged bottle-feeding and night-time bottle use are genuinely linked to a higher prevalence and severity of early childhood decay.

What the Study Examined

The review followed standard scientific guidelines and searched major medical and dental databases for observational studies involving children aged 71 months or younger. The researchers looked for studies that reported dental decay outcomes—measured using standard scoring systems for decayed, missing, and filled teeth—in relation to bottle-feeding duration and night-time bottle habits.

In total, the review included 12 observational studies, comprising two prospective cohorts and ten cross-sectional studies with a combined total of 6,955 children.

Key Findings

The review reported several distinct findings regarding age, duration, and timing:

• First Year of Life: Bottle-feeding that was strictly limited to the first year of life was not associated with an increased severity of tooth decay.
• Continuation After 12 Months: Continuing bottle-feeding beyond 12 months was associated with a gradual increase in decay severity.
• Prolonged Use Beyond 24 Months: Bottle-feeding that extended past 24 months showed a consistent and clinically relevant increase in the severity of early childhood caries.
• Nocturnal Use: Giving a bottle at night further amplified the risk, especially when continued past 24 months, showing signs of a dose-response relationship.

Despite these patterns, the authors of the review noted that the overall certainty of the evidence was low to very low. This was primarily because the underlying research relied on observational study designs, varied in how exposures were defined, and included potential residual confounding factors.

What This Means for Patients

While every child’s development is unique, this research highlights a general trend connecting extended and night-time bottle-feeding past the age of two to higher rates of early childhood tooth decay. Parents and caregivers aiming to support their young children’s oral health may find it helpful to discuss infant feeding transitions and age-appropriate cup use with a dental professional during routine check-ups.