Book excerpt: A Girl's Guide to Puberty and Periods is a body-positive illustrated book that helps girls, ages 9-14, understand what to expect about puberty and everything that goes with it. The book shares "my first period" stories from girls across the U.S. of all backgrounds to help your child understand that everything they are going through is okay and normal. Parents will appreciate that the book also incorporates factual health content and practical tips developed by health experts at Columbia University. The goal is to empower girls to feel more confident and knowledgeable about their changing bodies.