Panda Bear, Panda Bear, What Do You See? by Bill Martin Jr.
This book is repetitious, which is great for kids. The animals are a little obscure though: macaroni penguin, whooping crane, etc. The artwork is Eric Carle and he's very popular.

How Do You Make a Baby Smile? by Philemon Sturges
This book talks about all kinds of animals and how their Mama or Papa makes them smile. The pictures are cute, almost clipart like.

Two Little Trains by Margaret Wise Brown
She wrote Goodnight Moon, another children's classic. This is an interesting story that compares a real train with a toy train in facing pages. When the real train is getting rained on, the toy train moves underneath a showerhead.