To elucidate the association between breastfeeding and the child’s behavioral outcomes, logistic regression tests were performed using the presence of ADHD and either internalizing, externalizing, or overall behavioral problems as the outcome variable and a history of breastfeeding as the principal predictor, after adjusting for gender, age, residential area, and yearly family income (Model 1). Then, models were adjusted for the child’s IQ (Model 2). Finally, the adjustment for maternal IQ was conducted (Model 3). All predictive variables were concurrently entered into the model, and adjusted odd ratio (AOR) for breastfeeding was calculated.