Timing of solid food introduction and risk of obesity in preschool-aged children

Area of Science:

• Pediatric Nutrition
• Public Health
• Developmental Pediatrics

Background:

• Infant feeding practices are crucial for long-term health outcomes.
• Early introduction of solid foods is a debated topic in pediatric nutrition.
• Childhood obesity is a growing public health concern with significant long-term implications.

Purpose of the Study:

• To investigate the association between the timing of solid food introduction in infancy and the development of obesity at three years of age.
• To differentiate this association based on infant feeding type (breastfed vs. formula-fed).

Main Methods:

• Prospective birth cohort study (Project Viva) involving 847 children.
• Exposure: Timing of solid food introduction (<4, 4-5, ≥6 months).
• Outcome: Obesity at 3 years (BMI for age/gender ≥95th percentile), analyzed using logistic regression, adjusting for covariates.

Main Results:

• Among formula-fed infants, introducing solids before 4 months was linked to a sixfold increase in obesity odds at age 3 (OR: 6.3; 95% CI: 2.3-6.9).
• This association in formula-fed infants persisted even after adjusting for early growth markers.
• No significant association was found between the timing of solid food introduction and obesity in breastfed infants.

Conclusions:

• Early introduction of solid foods (before 4 months) is associated with increased odds of obesity at age 3 years in formula-fed infants.
• The findings suggest that feeding type modifies the impact of solid food introduction timing on childhood obesity risk.
• These results underscore the importance of age-appropriate introduction of solids, particularly for formula-fed infants.