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The Association Between the Early Introduction of Solid Food and Childhood Obesity Risk: A Systematic Review
Surendra Gupta1,2, Purushottam Lal3, Rakesh Sharma4
1Pediatrics, Clinica Sierra Vista, Fresno, USA.
Cureus
|January 16, 2026
Summary
Introducing solid foods before four months of age may increase childhood obesity risk, especially for formula-fed infants. More research is needed due to study limitations.
Area of Science:
- Pediatrics
- Nutrition Science
- Public Health
Background:
- Childhood obesity is a significant global health concern.
- The optimal timing for introducing solid foods during infancy remains a subject of ongoing research and debate.
- Early life nutrition plays a critical role in long-term health outcomes.
Purpose of the Study:
- To systematically review and evaluate the association between the timing of solid food introduction in infancy and the risk of childhood obesity.
- To specifically investigate if introducing solids before four months of age increases the likelihood of overweight or obesity in children.
Main Methods:
- A systematic search was conducted across five major databases (PubMed/MEDLINE, Embase, Web of Science, Cochrane Library, Google Scholar) up to January 15, 2025.
- Included studies were observational (cohort, cross-sectional, quasi-experimental, case-control) assessing solid food timing and childhood obesity.
- Seventeen studies were included after screening 1,402 records; data extraction and quality assessment were performed by two independent reviewers.
Main Results:
- Most studies (17 included) indicated an association between introducing solid foods before four months and increased childhood obesity risk or higher BMI z-scores.
- This association was more pronounced in formula-fed infants compared to breastfed infants.
- Significant heterogeneity in study design, exposure classification, and outcome measurement limited direct comparison and meta-analysis.
Conclusions:
- Early introduction of solid foods (before four months) appears linked to a higher risk of childhood obesity, particularly when breastfeeding is absent.
- Findings should be interpreted cautiously due to considerable variability and methodological limitations, including potential confounding and reliance on parental recall.
- High-quality prospective studies employing standardized outcome measures are necessary to confirm these associations.
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