My son is 6 months old and this is his favorite book by far. He likes all the books I read to him, but when he sees this book he gets really excited. He kicks his feet, smiles and "talks" to the pictures and reaches out to touch them. He has a lot of books, but this is the only book that he gets this excited about. If I bring out a stack of books to read to him, he reaches for this one above the others. He especially likes the last page with the pop-up. The images on the pages are very big and simple, and each page is a different color. I think that's why he likes it so much. Other books have too many pictures on the pages and the colors are not as bright and bold. I think the big simple pictures and bright bold colors are more interesting for babies of my son's age. I'm going to buy some other books in the Sesame Beginnings series since he likes this one so much. I even went out and bought him a little Elmo doll so he can hold it while we read his favorite book! He loves it!