@mckenzc oh yes +1 to happiest baby on the block. There’s also a “sleep edition” of the book which is the one I have. It definitely works!however I was not a fan of the wonder weeks. It didn’t line up for my daughter at all. She was in the NICU for 2 months (she was full term and I went by due date like you are supposed to) so I don’t know if that somehow threw her off even though she wasn’t developmentally delayed in any other way.