This document discusses puberty and the physical and emotional changes that occur during this developmental period. It outlines some of the main signs of puberty such as growth spurts, body shape changes, hair growth, skin changes, voice changes, and hormone fluctuations. Specific physical changes are described for both girls and boys. The document also briefly outlines topics related to human reproduction including a magnified view of sperm fertilizing an egg. Potential consequences of teen pregnancy are listed such as lower education attainment and higher risks for children of teen mothers.