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Metabolisable energy consumption in the exclusively breast-fed infant aged 3–6 months from the developed world: a systematic review

Published online by Cambridge University Press:  08 March 2007

John J. Reilly*
Affiliation:
University of Glasgow Division of Developmental Medicine, Yorkhill Hospitals, Glasgow G3 8SJ, UK
Susan Ashworth
Affiliation:
University of Glasgow Library, Hillhead Street, Glasgow G12 8QQ, UK
Jonathan C. K. Wells
Affiliation:
MRC Childhood Nutrition Research Centre, Institute of Child Health, University College London, 30 Guilford Street, London WC1N 1EH, UK
*
*Corresponding author: Dr John J. Reilly, fax +44 (0) 141 201 9275, email [email protected]
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Abstract

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The present study aimed to evaluate evidence on metabolisable energy consumption and pattern of consumption with age in infants in the developed world who were exclusively breast-fed, at around the time of introducing complementary feeding. We carried out a systematic review aimed at answering three questions: how much milk is transferred from mother to infant?; does transfer increase with the age of the infant?; and what is the metabolisable energy content of breast milk? Thirty-three eligible studies of 1041 mother–infant pairs reported transfer at 3–4 months of age, the weighted mean transfer being 779 (SD 40) g/d. Six studies (99 pairs) measured transfer at 5 months, with a weighted mean transfer of 827 (SD 39) g/d. Five studies (72 pairs) measured milk transfer at 6 months, reporting a weighted mean transfer of 894 (SD 87) g/d. Nine longitudinal studies reported no significant increases in milk transfer after 2–4 months. Twenty-five studies on breast-milk energy content were based on 777 mother–infant pairs. The weighted mean metabolisable energy content was 2·6 (SD 0·2) kJ/g. Breast-milk metabolisable energy content is probably lower, and breast-milk transfer slightly higher, than is usually assumed. Longitudinal studies do not support the hypothesis that breast-milk transfer increases markedly with age. More research on energy intake in 5–6-month-old exclusively breast-fed infants is necessary, and information on the metabolisability of breast milk in mid-infancy is desirable. This evidence should inform future recommendations on infant feeding and help to identify research needs in infant energy balance.

Type
Research Article
Copyright
Copyright © The Nutrition Society 2005

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