Robie Harris and Michael Emberley have once again teamed to create a friendly, accessible book about sex education—this time geared toward older preschoolers and early-elementary age children. “Where do babies come from?” is the big question they tackle, once again showing respect for their young audience by offering a reply that is detailed and honest. Beginning with similarities and differences between boys and girls, they go on to explain what happens when bodies mature, the role of eggs and sperm and how they come together, and the development of a fetus inside a woman’s womb. The bird and bee characters that asked essential questions (and provided comic relief) in the duo’s two volumes for older children, It’s So Amazing (1999) and It’s Perfectly Normal (1994), both published by Candlewick, play the same role here. Despite the unfortunate decision to anthropomorphize the eggs and sperm in some illustrations, giving them comical faces and personalities, this amiable, informative book will be a welcome resource for many families. (Ages 4–8)