Relationship between various maternal body mass measures and size of the newborn

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Abstract
As shown in 44,725 consecutive pregnancies (21,861 white women and 22,864 Black women), body-mass indices that include stature are no more effective than prepregnancy weight in “predicting” the size of the newborn. As calculated for weight-for-height and height-for-weight indices, using both correlations and comparison of decile groupings, birth weight and birth weight variability (σ) are better related to maternal prepregnancy weight than the body mass indices using roots or powers of weight and height.

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