Large summer weight gain in relatively overweight preschool Japanese children

Area of Science:

• Pediatric Growth and Development
• Human Physiology
• Childhood Nutrition

Background:

• Recent shifts in Japanese children's lifestyles may impact physical development.
• Understanding growth patterns is crucial for monitoring child health.
• Seasonal variations in growth are a key aspect of pediatric development.

Purpose of the Study:

• To investigate and explain the seasonal patterns of physical growth in Japanese preschool children.
• To compare growth seasonality between children with normal and high body mass index (BMI) at age five.
• To identify potential differences in seasonal weight and height gains based on BMI status.

Main Methods:

• A 6-year longitudinal study tracked 148 boys and 113 girls from age 0 to 6.
• Monthly growth data (weight and height) were collected from April 1990 to March 1996.
• Children were categorized into normal (<17) or high (≥17) BMI groups at age five for comparative analysis.

Main Results:

• Normal BMI children showed greater weight gain in autumn.
• High BMI children exhibited increased weight gain in autumn (ages 0-4) and summer (age 5).
• Both normal and high BMI groups experienced greater height gain during spring and summer.

Conclusions:

• Findings align with prior research for normal BMI children.
• Novel observation: High BMI children experienced significant weight gain during summer months.
• Seasonal growth patterns differ between normal and high BMI children, particularly in weight gain during specific seasons.