We love the rhythm and rhyme of this simple story, and my sons love the three-dimensional, glittery butterflies. Page by page, the butterflies "disappear" as they go to sleep. Each page is beautifully illustrated in hues of a particular color, coordinating with the butterfly that is "going to sleep" next. It's a fun and sweet bedtime story.
This was one of my oldest son's first favorites at around 8 months old, and I partly credit this book with him learning all his colors by the time he was 16 months old! My younger son (now 17 months old) wasn't interested in books at all until he was almost a year old, and this is the book that really got him excited about books. It is still his favorite!