Short- and medium-term outcomes of accelerated infant growth in a Hong Kong Chinese birth cohort

Area of Science:

• Pediatrics
• Child Health
• Growth and Development

Background:

• Childhood obesity is a growing public health concern.
• Early life growth patterns, including birth weight and infant growth velocity, are potential determinants of later body mass index (BMI).
• Understanding these early life influences is crucial for developing effective prevention strategies.

Purpose of the Study:

• To investigate the association between birth weight, infant growth velocity (particularly in the first year of life), and body mass index (BMI) at 7 years of age in a Chinese birth cohort.
• To examine sex-specific differences in these associations.
• To explore the relationship between rapid infant growth and serious infectious morbidity.

Main Methods:

• Utilized data from a large, population-representative Chinese birth cohort.
• Analyzed associations between birth weight, growth velocity at 0-3 months and 3-12 months, and BMI at 7 years.
• Assessed the impact of rapid growth on the risk of serious infectious morbidity.

Main Results:

• Higher birth weight and rapid infant growth, especially between 0-3 months, were significantly associated with higher BMI at 7 years.
• Boys born heavier and experiencing rapid growth exhibited the highest BMI, but rapid growth had a more pronounced effect on BMI in lighter-born boys.
• Rapid growth in infancy (0-3 or 3-12 months) was not linked to a reduced risk of serious infectious diseases.

Conclusions:

• Early life growth trajectories, particularly rapid growth in infancy, are associated with increased childhood BMI.
• The findings suggest that rapid growth may reflect an underlying good health status rather than causally protecting against adverse health outcomes like infections.
• These insights have implications for monitoring child development and understanding the complex interplay between early growth and long-term health.