Little Gorilla (used the big version of this as the guest book at my sister's baby shower)
Anything by Sandra Boynton
I am not a fan of the Mo Willems books (there, I said it!). Cute illustrations but too many words for me. HA! I really do not like Yummy Yucky and No No, Yes Yes because they just seemed to offer new ideas to H who hadn't even thought of doing the no no and yucky things!
What books are on your child's bookshelf?