Prediction of large-for-gestational-age infants in pregnancies complicated by obesity: A population-based cohort study.

Performance of the prepregnancy and early pregnancy prediction models for LGA in parous women with BMI ≥30 kg/m2 was good. The predictive capacity was largely driven by previous child's birthweight. First-trimester measurements of fetal size did not improve the predictive capacity in parous women. Predictions of LGA in all women with BMI ≥30 kg/m2 in early pregnancy, without taking previous child's birthweight into account, remain difficult.