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Ken K L Ong a Department of Paediatrics,
University of Oxford, John Radcliffe Hospital, Oxford OX3 9DU, b Unit of Paediatric and Perinatal Epidemiology, University of
Bristol, Bristol BS8 1TQ, c Biochemistry,
Endocrinology, and Metabolism Unit, Institute of Child Health, London
WC1N 1AH
Correspondence to: D B Dunger dbd25{at}cam.ac.uk
Objective:
To identify predictors of postnatal
catch-up growth from birth to two years and its relation to size and
obesity at five years.
Design:
Regional prospective cohort study.
Setting:
Avon longitudinal study of pregnancy and
childhood, United Kingdom.
Subjects:
848 full term singletons from a 10% random sample of the Avon longitudinal study of pregnancy and childhood.
Main outcome measures:
Maternal birth weight,
prepregnancy weight, pregnancy weight gain, height, smoking, and
parity, and paternal height. Weight and length of infants at birth, two
years, and five years expressed as standard deviation (SD) scores from
the UK reference scores for 1990. Percentage fat mass and total fat mass (estimated from skinfolds) and waist circumference at five years.
Results:
Size at birth was representative of the
national reference. Overall, 30.7% (260 of 848) of infants showed a
gain in SD score for weight greater than 0.67 SD scores between zero and two years, indicating clinically significant catch-up growth. These
children had lower weight, length, and ponderal index at birth than
other children, and were more often from primiparous pregnancies. They
also had taller fathers than other children, and their mothers had
lower birth weights and were more likely to smoke during pregnancy.
Children who showed catch-up growth between zero and two years were
heavier, taller, and fatter (body mass index, percentage body fat, and
waist circumference) at five years than other children.
Conclusions:
In this contemporary well nourished
cohort, catch-up growth was predicted by factors relating to
intrauterine restraint of fetal growth. Children who showed catch-up
growth between zero and two years were fatter and had more central fat distribution at five years than other children. Mechanisms that signal
and regulate early catch-up growth in the postnatal period may
influence associations between small size at birth and risks for
disease in adulthood.
© BMJ 2000
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