Our kiddo got this book from the pediatrician's office when he was about 3 months old. We initially thought it was bedtime routine propaganda aimed specifically at us, since our son wasn't sleeping well at the time. It turns out they just give the kids books at every well-child visit.
It's the standard going-to-bed fare with photos of babies playing, eating, having a bath, and then settling for the night. It's just okay in my opinion, but the kiddo loves it, perhaps because they're photos instead of illustrations. He loves talking about what the babies are doing and even kisses the baby goodnight at the end sometimes.