What should parents do when their eight year old daughter has the body of a thirteen year old? More families are facing that question, as a greater percentage of girls in the United States are experiencing puberty at earlier ages. Dr. Louise Greenspan, a pediatric endocrinologist, and Dr. Julianna Deardorff, an adolescent psychologist, are two of the leading investigators researching the root causes and effects ofearly puberty in girls. They join us to discuss early onset puberty, and their book, The New Puberty: How to Navigate Early Development in Today?'s Girls.