My 8 month old is VERY into flap books right now! Open the Barn Door has been the fave in our house.

Also highly recommend these linking rings! My mom picked them up for LO and they're a huge hit. Easy to wash & dry, and they are technically a toy themselves but can also be used to connect to other toys. I would probably be worried about my baby's toys hitting the floor in the hospital, so these could be hooked to a crib rail and help with that issue!

Also easy to clean are these IKEA stacking cups - I know several babies in this age range who are obsessed. My LO will happily sit and destroy the tower as many times as I'll make it, but he also just likes to hold/chew on the cups.