Start reading it to your baby now!
I don't know why all the copies here are so expensive, but pick up a board book copy from any bookstore and you won't be disappointed. This is one of the first books my son got excited about as a young baby. I would read "wishy-washy" and swish him back and forth! (Plus, it helped with bathtime because I would "wishy-washy" him clean!) An added bonus: this book is frequently used in kindergartens with children learning to read independently.