How were annular skull deformations made with constricting bands?

Annular skull deformations are produced by the application of a constricting band around an infant's head. This method is distinct from tabular deformations, which are achieved through the use of small boards or other flattened surfaces to exert pressure.1

These practices are categorized under body modifications and mutilations, a field that encompasses various intentional alterations to the human form, including the cranium, teeth, lips, nose, and ears. While these modifications have been documented across most continents, they are historically significant as cultural practices that result in skull shapes strikingly different from the unmodified anatomy. It is important to note that such practices, including head flattening, have been observed to have no effect on an individual's mental capabilities.12