A list of secondary sex characteristics that represent biological changes undergone during puberty.
| In Females | Age Range of Appearance |
| Breast development | 8-13 |
| Pubic hair development | 8-14 |
| Growth spurt | 9.5-14.5 |
| Menarche | 10-16.5 |
| Underarm hair | Approximately 2 years after the appearance of pubic hair |
| Increased oil- and sweat-gland output | Simultaneous with underarm hair |
| In Males | Age Range of Appearance |
| Growth of testes, scrotum | 10-13.5 |
| Pubic hair development | 10-15 |
| Growth spurt | 10.5-16 |
| Increase in size of penis | 11-14.5 |
| Change in voice | 11-14.5 (same as growth of penis) |
| First ejaculation | Approximately 1 year after penis growth |
| Facial and underarm hair | Approximately 2 years after the appearance of pubic hair |
| Increased oil- and sweat-gland output | Simultaneous with underarm hair |
Excerpted From:
Excerpt from Middle Childhood to Middle Adolescence: Development from Ages 8 to 18, by L.B. Blume, M.J. Zembar, 2007 edition, p. 237.
© ______ 2007, Merrill, an imprint of Pearson Education Inc. Used by permission. All rights reserved. The reproduction, duplication, or distribution of this material by any means including but not limited to email and blogs is strictly prohibited without the explicit permission of the publisher.
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