Postnatal catch-up fat after late preterm birth

Area of Science:

• Neonatalogy
• Pediatric Growth and Development
• Body Composition Analysis

Background:

• Late preterm birth (34-36 weeks gestation) constitutes a significant portion of all preterm births.
• Understanding postnatal growth patterns in late preterm infants is crucial for assessing long-term health outcomes.

Purpose of the Study:

• To investigate postnatal weight gain and body composition changes in late preterm infants.
• To compare growth trajectories and fat mass accumulation between late preterm and full-term infants.

Main Methods:

• A cohort of 49 late preterm infants and 40 full-term infants were studied.
• Body composition was assessed using air displacement plethysmography at birth, term-corrected age, and 1 and 3 months corrected age.

Main Results:

• Late preterm infants exhibited a 182% increase in fat mass between birth and term-corrected age.
• At term and 1 month corrected age, late preterm infants had significantly higher mean weight and fat mass percentage compared to full-term infants.
• No significant differences in weight or fat mass were observed between groups at 3 months corrected age.

Conclusions:

• Late preterm infants demonstrate rapid postnatal fat accumulation (catch-up fat).
• The long-term implications of this accelerated fat gain on chronic disease risk require further research.
• This rapid fat increase might represent an adaptive response to extrauterine life.