As a result of random assignment, the intervention group was paired with the first block of time and the control group with the second one. During the 2 time blocks, 194 and 191 normal birth weight infants were born, respectively. The first consecutive 140 families who met the recruitment criteria were enrolled during each block of time. All of the families who were enrolled agreed to participate in the interview and in the training session. None of the participants was lost to the follow-up both at 6 and at 12 months.