Understanding one's sexuality is a lifelong process. This pamphlet outlines developmental markers for what children need to know about sexuality, from infancy through adolescence. These guideposts can help parents, caregivers, and educators decide when a discussion of a given subject is age-appropriate. They may be particularly helpful for those who develop curricula or other programs. They include information and concepts about sexuality and reproduction that children need to learn at different ages. With the information and sets of skills outlined in this pamphlet, children are more likely to feel good about their sexuality and make the best possible choices for themselves, their partners, and their futures.