The authors reported that this was a double-blinded study. Outcome assessors who collected the data were not aware of group allocation. The data collectors, who were blinded to the randomization of participants, asked a series of questions 15 to 60 minutes after each completed postpartum interviews. However, we were not able to ascertain if patients were aware of the nature of the study or their group allocation. It is not clear whether the study hypothesis was stated to mothers, but they did have to provide informed consent to participate and were aware of the position of the interviewer. Most important, the 2 pediatricians who conducted the interviews were not blinded to the group allocation, and they were also the study investigators who knew the hypotheses. They attempted to account for interviewer bias by trying to keep the time of the interview and number of questions consistent. However, it is possible that the pediatricians might have unknowingly behaved differently in the various positions during the interviews. For example, a pediatrician who believed that sitting on the bed would make a significant difference might ask questions with a different intonation or change in body language, thus biasing the data to demonstrate positive results. Although the investigators were not blinded, the negative results of this study suggest that any investigator bias present did not significantly affect the results.