The growth and development of six XYY children: a continuative report.

This report will not recapitulate the parentage, birth history, and early progress of these 6 randomly ascertained XYY boys. Those facts are on record [1]. The boys are the same; the follow-up has remained as unobtrusive and as undisturbing to their parents as possible. The author's anxieties in this respect have not diminished, however; rather they have been increased by a new encounter with the father of Case 1. This report might be criticized as anecdotal rather than factual, but it is perhaps on anecdotal evidence that in daily life one judges normality or otherwise. In the final analysis, it is how these boys function, and will continue to function in their societies, that matters.