“…Once this conversion has occurred, hairs are uniformly distributed at all stages of the growth cycle. There is considerable variation in the age at which the mosaic pattern develops (27), however, and it is not uncommon for children to have little hair for many months after the initial postnatal teiogen fall. Once the mosaic pattern has developed, it is maintained unless modified by disease, such as teiogen effluvium (15), During the years prior to puberty, a gradual transition takes place of scalp hair from vellus through intermediate to terminal hairs (9), During this time changes in the shape and size of the hair shaft may be related to the different hair forms.…”