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The effect of fetal and placental weight at birth on weight during early childhood.

A study of children whose birth weights or placental weights were above the 90th or below the 10th percentile for gestational age indicated that bigness at birth tends to be an innate quality, as the majority of those who were large at birth remained oversized. The small at birth are not all destined to remain diminutive, as the children in this category attained a normal distribution curve for weight during the first year of life. Thus smallness at birth may represent intrauterine nutritional deprivation and be overcome with normal access to calories. The influence of the placenta on infant size is temporary and is modified by extrauterine nutrition. Thus, although there was a direct relationship between birth weight and placental weight, the distribution of weight of children with either large or small placentas was not significantly different from the expected normal distribution at one year of age.