We can understand that Mr Der and his colleagues are unhappy that the recently published results from our Promotion of Breastfeeding Intervention Trial (PROBIT)1 disagree with the results of their observational study.2 But in their attempt to undermine our study, they have substantially distorted both our methods and our findings.
Kramer MS, Platt RW. Breastfeeding, Breast-Milk Feeding, Breast Feeding, and IQ: Unknown and Known Knowns—Reply. Arch Gen Psychiatry. 2008;65(12):1458-1459. doi:10.1001/archpsyc.65.12.1458