Do children recall the birth of a younger sibling? Implications for the study of childhood amnesia.

To establish the parameters of childhood amnesia, researchers often ask adults to recall events for which the exact date is known. One event of this kind is the birth of a sibling, but is this an event that children are likely to understand and encode at the time that it occurs? Here, we report the first examination of age-related changes in the content and accuracy of 2- to 5-year-old children's accounts of the recent birth of a sibling. The interview procedure we used was identical to that used in a prior study with adults, so we had the opportunity to compare children's recall with that of adults who were matched on age at the time of the birth. For both children and adults, the amount of information reported and the number of questions answered increased as a function of age at the time of the birth. Relative to children, adults reported more information and answered more questions. These findings suggest that the failure of adults to recall the birth of a younger sibling that occurred when they were very young may be due primarily to a failure to effectively encode the event in the first place.