Set up their personal library.
The idea: Buy one of your favorite childhood books — or one that your own kids love — and write a message on one of the blank pages for baby sharing why you love the book so much. If applicable, include why the message or certain details of the book influenced your choice and what it means to share that book with them.
Make it extra meaningful: If you know baby's name, purchase a "From the library of [Name]:" personalized stamp (or stickers!) for everyone to use on the inside cover of the book (if their name is still a secret or hasn't been chosen yet, grab a stamp that has a line instead so that their parent can fill in their name later!).