Your three smallest bones — called the malleus (hammer), incus (anvil), and stapes (stirrup) — are all tucked inside your middle ear, and they’re so tiny that together they could easily fit on a penny with room to spare!
Human Body - Facts for Kids

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Random Facts About Human Body For Kids
Your bones have their own recycling system — old bone cells are broken down and the materials are used to make new bone!
Growth & Development
Your esophagus starts forming when you’re just a tiny embryo — only about the size of a pea!
Every time you swallow, the muscles in your esophagus get a tiny workout — helping them stay strong and ready!
Trimming your nails regularly (about every 1–2 weeks) helps keep them healthy and prevents them from breaking!