In the final model including early and current life factors, the lowered odds of being overweight associated with increased breastfeeding duration remained, whereas the association with normal birth weight was in the same direction but borderline significant ( P = 0.081) after adjusting for maternal BMI.
In multivariable analyses, continued breastfeeding between 6 and 11 months was associated with approximately halved odds of both being overfat (adjusted odds ratio [aOR] = 0.43, 95% confidence interval [CI] 0.21–0.91, P = 0.027) and overweight (aOR = 0.46, CI 0.26–0.82, P = 0.0083), but the association with prehypertension did not reach statistical significance (aOR = 0.72, CI 0.38–1.37, P = 0.32).