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Body composition from birth to 6 months in term small-for-gestational-age Indian infants: effect of catch-up growth

Published online by Cambridge University Press:  31 May 2024

Brijesh Kumar
Affiliation:
Paediatric Endocrinology Division, Department of Paediatrics, All India Institute of Medical Sciences, New Delhi 110029, India
Pratima Anand
Affiliation:
Neonatology Unit, Department of Paediatrics, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
Harish Chellani
Affiliation:
Neonatology Unit, Department of Paediatrics, Vardhman Mahavir Medical College and Safdarjung Hospital, New Delhi, India
Ramesh Agarwal
Affiliation:
Neonatology Unit, Department of Paediatrics, All India Institute of Medical Sciences, New Delhi, India
Vandana Jain*
Affiliation:
Paediatric Endocrinology Division, Department of Paediatrics, All India Institute of Medical Sciences, New Delhi 110029, India
*
*Corresponding author: Vandana Jain, email [email protected]

Abstract

The objective of this prospective observational study was to assess the growth and body composition of term small-for-gestational-age (SGA) infants from birth to 6 months and evaluate the effect of catch-up growth (CUG) on body composition. Term SGA newborns were recruited at birth. Anthropometry and body composition were evaluated at 3 days, 6, 10 and 14 weeks, and 6 months. Fat and fat-free mass (FM and FFM) were compared between infants with and without CUG (increase in weight Z-score by > 0·67) by air displacement plethysmography. Factors that could affect body composition and CUG, including parents’ BMI and stature, infants’ birth weight, sex and feeding, were evaluated. A total of 143 SGA newborns (sixty-six boys) with birth weight of 2336 (sd 214) g were enrolled; 109 were followed up till 6 months. Median weight Z-score increased from −2·3 at birth to −1·3 at 6 months, with 51·9 % of infants showing CUG. Infants with CUG had higher FM (1796 (sd 491) g v. 1196 (sd 474) g, P < 0·001) but similar FFM (4969 (sd 508) g v. 4870 (sd 622) g, P = 0·380), and consequently higher FM percentage (FM%) (26·5 (sd 5·8) v. 19·7 (sd 6·9), P < 0·001), compared with those without CUG. Lower birth weight, exclusive breast-feeding and higher parental stature were positively associated with CUG. In conclusion, CUG in term SGA infants in the first 6 months of life was almost entirely attributable to greater gain in FM. Follow-up of this cohort will provide insight into the long-term effect of disproportionate gain in FM in early infancy in SGA babies.

Type
Research Article
Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of The Nutrition Society

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