In the second stage of puberty, a girl's ovaries increase their output of "estrogen".
The second phase of puberty starts around the age of 13. At this stage, the body encounters sudden development spurts. This outcomes in some extremely conflicting physical extents and ungainly developments may emerge as well. Estrogen, or estrogen, is the essential female sex hormone. It is in charge of the improvement and control of the female conceptive framework and auxiliary sex qualities.