The Relationship Between Gestational Age and Birth-Weight in Twin Pregnancy

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Abstract
Analysis was made of fetal growth in 563 twin pregnancies. The birth weight of a twin is affected by the duration of pregnancy and zygosity. Intrauterine growth and weight is the same as a singleton pregnancy up to a gestational age of 32 wk. After this stage fetal growth slows markedly. The growth curves of both twins are similar with an increasing tendency towards growth retardation in twin 2 after 39 wk gestation. Intrauterine growth retardation, as represented by the 10th percentile line, for twin 1 joins 1094 g at 31 wk, 1836 g at 36 wk and 2428 g at 40 wk gestation. The corresponding figures for twin 2 are 1131 g, 1875 and 2337 g, respectively.

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