We LOVE books around here. We have books galore and have since hte boys were little. I was read to since I was a baby and I guess it stuck because I read to the boys very early on as well.
I was going to organize our recommendations by age but then I realized I have no idea what ages are good for some of these books so I'll just talk about some of our favorites.
My little one is reading an Elephant and Piggie book by Mo Willems. We LOVE Mo Willems. I think A Pigeon Finds a Hot Dog was the first book my son could "read" (he had the thing memorized along with the WAY I read it). Any of his books are SO fun to read. The Pigeon series, Elephant and Piggie series, Knuffle Bunny, Naked Mole Rat etc. I like to give any of these books to new moms because I think that ANY Mo Willems book is a must have in any kids' library.
We also like the Skippy Jon Jones series
Fun songs AND you get to read it in a Spanish accent!
My 6 year old loves reading any book from the Froggy series
I don't like how Froggy always answers "Whaaaat" I think it's rude but he likes the books and it helps him read and he hasn't responded to me like that yet so we'll let it slide ;) He also likes Lego readers, Star Wars readers etc.
I know I'm forgetting a few of their favorites, but these ones I know for sure. What are some of your/your kids' favorite series?