2 books · Ages 4–8
What to Expect When You're Expecting (Animals) is a 2-book series for ages 4–8 by Bridget Heos. Each book stands alone — start anywhere.
Start anywhere — each book stands alone.
That said, What to Expect When You're Expecting Hatchlings and What to Expect When You're Expecting Joeys are great first picks.
No particular order needed — browse and pick what catches your eye.