The biological transition of adolescence, or, puberty, can be considered the most salient sign that adolescence has begun. Technically, puberty refers to the period during which an individual becomes capable of sexual reproduction. More broadly speaking, however, puberty is used as a collective term to refer to all the physical changes that occur in the growing girl or boy as the individual passes from childhood into adulthood. The physical and hormonal changes that occur during transitions into puberty are some of the most transformative changes a human experience. Adequate education and awareness is required to properly manage the changes a body undergoes during this period.

One key aspect of puberty for young girls is menstrual hygiene management (MHM). It is crucial for VYA, as menstruation can be a source of confusion, shame, and decreased school attendance and performance for young girls. This section provides resources on Advocacy, Program Implementation, and Research about transitions in to puberty, including MHM.