The book is addressed to children 11-15 years old and their parents. The author - a teacher and psychologist - talks with the reader about puberty and various changes taking place in the body of a teenage girl during this period. The book will help the child understand: everything that happens to him is normal; will also very correctly talk about the peculiarities of male and female physiology, answer many questions that children hesitate to ask, and save parents from the obligation to speak on "slippery" topics.