3 books · Ages 3–8 · Chapter Books
Usborne Flip-Flaps is a 3-book series for ages 3–8 by Judy Tatchell. Each book stands alone — start anywhere.
Start anywhere — each book stands alone.
That said, How Do Your Senses Work? and How are Babies Made? are great first picks.
No particular order needed — browse and pick what catches your eye.