
A cross-sectional study assessed insulin-like growth factor-1 (IGF-1) levels in 252 healthy infants and prepubertal children, with a mean age of 3.7 years. Results showed that girls had significantly higher IGF-1 levels than boys (P < 0.001), especially among those with abnormal nutritional statuses. Children with overweight or obesity had notably lower IGF-1 levels compared to children in other BMI categories. Positive correlations were observed between IGF-1 levels and arm muscle area Z scores in infants and toddlers, and weight and BMI Z scores in children aged three to four. Breastfeeding did not show a significant association with IGF-1 levels. These findings suggest that IGF-1 is influenced by gender and nutritional status but not breastfeeding.
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