Final answer:
Education about sexual feelings and body changes should start in the preschool years, continue through elementary school, and be addressed as children grow to provide accurate information and guidance.
Step-by-step explanation:
Education about sexual feelings and developmental changes in the body should begin during early childhood, specifically the preschool years (ages 3 to 5). Given that this is a period of significant physical, cognitive, and psychosocial development, children at this stage are capable of beginning to understand basic concepts about their bodies. Continuing education through the elementary school years is important as well, as children become more independent, active, and involved with friends. Because early or late onset of puberty can cause self-conscious feelings, and because misinformation can occur through informal conversations, it is crucial to provide proper guidance and factual information as early as possible.