Ababy is considered a small-for-gestational-age infant if because of delayed fetal growth the baby weights 90% (or less of the average weight of other infants of the same gestational age. the baby was born 38 weeks after conception. the baby weighs less than 1,250 grams. the baby weighs less than 2,500 grams.

A baby who is small-for-gestational-age is smaller than the usual pregnancy week and the weight of the baby is 10 percentile lesser than that of a normal infant of the same gestation age. This may occur due to multiple gestations, infections, genetic defects or maternal factors like high blood pressure, diabetes etc.

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