Why Do We Have Belly Buttons?

SciShow Kids

This engaging video from SciShow Kids explores the biological origin and purpose of the belly button. Host Jessi explains that a belly button (or navel) is actually a scar left behind by the umbilical cord, which served as a lifeline for transferring oxygen and nutrients from mother to baby during pregnancy. The video uses clear animations to demonstrate how babies grow inside the womb and why the cord is no longer necessary once a baby is born and can breathe and eat on its own. The video extends the concept beyond humans to the animal kingdom, distinguishing between mammals and egg-laying animals. Students learn that other mammals like dogs, cats, and chimpanzees also have belly buttons, though they might be hidden by fur or bitten off by mothers in the wild. Conversely, the video explains why animals that hatch from eggs, such as birds and reptiles, do not have belly buttons, introducing a key biological difference between these animal groups. This resource is an excellent tool for early elementary science classrooms to introduce basic anatomy, human development, and animal classification. It answers a common curiosity-driven question children have about their bodies while seamlessly integrating vocabulary like "umbilical cord," "nutrients," "mammals," and "navel." Teachers can use this video to spark discussions about how living things grow, the needs of infants versus adults, and the similarities between humans and other animals.