Postnatal development of bone mineral status during infancy

Area of Science:

• Pediatric Bone Health
• Infant Physiology
• Anthropometry

Background:

• Assessing bone mineral status in infants is crucial for early detection of potential health issues.
• Understanding the factors influencing bone development in early life is essential for establishing normative growth patterns.

Purpose of the Study:

• To investigate the changes in bone mineral status during the first year of postnatal development.
• To identify key anthropometric and physiological predictors of bone mineral status in healthy infants.

Main Methods:

• A cross-sectional observational study involving 130 healthy infants (aged 1-391 days).
• Whole body bone mineral content (TB BMC) and bone mineral density (TB BMD) were measured using dual-energy X-ray absorptiometry (DXA).
• Multiple linear regression analysis was employed to determine the relationship between bone mineral status and independent variables.

Main Results:

• Significant increases in average TB BMC (389%) and TB BMD (157%) were observed during infancy.
• Body weight was the strongest predictor, explaining 97% of TB BMC, 98% of TB area, and 86% of TB BMD variation.
• Postnatal age and body length had minimal additional impact on explained variation; race, gender, and season were not statistically significant.

Conclusions:

• Body weight is the predominant determinant of bone mineral status in healthy infants.
• The differential increases in TB BMC and TB BMD highlight distinct developmental trajectories.
• The generated normative data can aid in identifying abnormal infant bone mineral status.