An author of a previously published study on pregnancy order and reproductive loss responds to criticisms leveled at the study in this letter to the editor. The controversial study was accused of biased data; the study under comment was a longitudinal study, with its inherent biases, based on length of study. The original study attempted to associate loss of 1st child with subsequent pregnancies; it was reported that 44% of Norwegian mothers whose 1st child died perinatally would go on to another pregnancy, based on a 7-year observation period. In addition, 41% of women whose 1st birth was of favorable outcome would go on to a 2nd birth. However, if the data for a 3-year period only were assessed, a tendency for mothers to quickly compensate for loss of an infant or pregnancy would be evident, but the equally great tendency for successful 1st birth mothers to go on to a 2nd birth would be unnoticed. In defence of the original article, the 7-year period reported alleviated some of the bias. The study period has been extended to 10 years now, and new data will be forthcoming.