Catch-up growth during childhood among very low-birth-weight children

M Hack, B Weissman, E Borawski-Clark
Archives of Pediatrics & Adolescent Medicine 1996, 150 (11): 1122-9

OBJECTIVES: To examine growth attainment and correlates of catch-up growth at 8 years of age in a cohort of very low-birth-weight (VLBW) children (< 1500 g), including appropriate and small-for-gestational-age children, and to compare their growth with normal-birth-weight (NBW) children.

DESIGN: Eight-year longitudinal follow-up of a cohort of VLBW children. A geographically based, randomly selected sample of NBW children was recruited at 8 years of age.

SETTING: Tertiary perinatal center.

PARTICIPANTS: Two hundred forty-nine VLBW children born between January 1, 1977, and December 31, 1979 (78% of survivors), of whom 199 were born appropriate for gestational age and 50 were small for gestational age (< -2 SD). The NBW population included 363 children.

MAIN OUTCOME MEASURES: For the VLBW population, rates of subnormal weight (below the third percentile) and height were obtained at birth, at 40 weeks (term), and at 8 and 20 months. For the VLBW and NBW populations, mean weight, height, and percentile distribution at 8 years were derived from the National Center for Health Statistics standards.

RESULTS: Catch-up growth to above the third percentile occurred between 40 weeks and 8 months, 8 and 20 months, and up to 8 years of age among the VLBW children. At 40 weeks, 54% were subnormal in weight and 60% were subnormal in height; at 8 months, 33% and 22%, respectively, and at 8 years, 8% were subnormal in weight and height. Small-for-gestational-age children had lower rates of catch-up growth. Multivariate analyses disclosed maternal height, race, birth weight, and neurologic abnormality to predict percentile distribution of height; and maternal height, small for gestational age, and neurologic abnormality to predict subnormal height.

CONCLUSIONS: Catch-up growth occurs during childhood among VLBW children. These results have implications when counseling parents about the potential growth attainment of their children.

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