adopting older kids w/ biological children in the house - questions

i feel bad, lol. our son dosen't have a baby book, but it isn't because he is adopted, it is because he is the third kid. our first has lots of stuff, second has a half filled out baby book, ds has some notes on a calendar somewhere. has anyone seen that episode of roseanne where dj asks where his baby book is, and roseanne ends up sticking a tic tac in it and telling him it is his first tooth? it is nice of you to think of these things, though, i am sure your new kids will appreciate anything you do :)