Body composition at birth and height at 2 years: a prospective cohort study among children in Jimma, Ethiopia

Area of Science:

• Pediatric Nutrition
• Growth Monitoring
• Body Composition Analysis

Background:

• Low birth weight is a known risk factor for childhood stunting.
• The specific role of birth body composition (BC) in stunting remains unclear.
• Understanding birth BC's impact is crucial for early growth interventions.

Purpose of the Study:

• To investigate the association between birth body composition (BC) and height-for-age z-score (HAZ) at two years of age.
• To determine if fat mass (FM) or fat-free mass (FFM) at birth influences linear growth.
• To identify early indicators of stunting risk based on neonatal body composition.

Main Methods:

• Prospective cohort study design.
• Measurement of infant fat mass (FM) and fat-free mass (FFM) within 48 hours of birth using air-displacement plethysmography.
• Linear regression analysis to assess the relationship between birth BC and HAZ at 24 ±3 months.

Main Results:

• A total of 268 children were analyzed, with a mean HAZ of -1.2 ±1.2 at two years; 25.8% were stunted.
• Fat-free mass (FFM) at birth showed a significant positive association with HAZ at two years, independent of birth length.
• Each additional kg of FFM at birth was associated with a 0.73 higher HAZ at two years (β=0.73, 95% CI: 0.08, 1.38).
• Fat mass (FM) at birth was not significantly associated with HAZ at two years.

Conclusions:

• Fat-free mass (FFM) at birth is a significant predictor of linear growth (HAZ) at two years, independent of birth length.
• Birth body composition, specifically FFM, explains variability in childhood stunting.
• Further research is needed to understand how modifying early infant BC impacts linear growth trajectories.