If you are currently pregnant or expecting a second child and have a toddler in the house, just buy this book. It’s a utility tool.
It doesn't have the wit of a Mo Willems book or the art of a Caldecott winner, but it does one thing exceptionally well: it keeps your firstborn from feeling replaced. It’s the Fred Rogers method in board-book form, which means it’s emotionally bulletproof and actually helpful for the transition.
It’s not 'exciting' literature, but when you're three weeks into sleep deprivation with a newborn, you'll be glad your toddler is quoting Daniel Tiger instead of throwing a tantrum.