I have no experience in the baby area of things but that idea sounds really cool. I would say pick out a box of something that you really like but make sure it is something special and that ages well and that you can really sit back and enjoy while reflecting on each year gone by.
For some reason I would think along the lines of getting a great box of CC's that you like (if you do, and if you can) and go with something along those lines. But the beauty of it all is that it's up to you!
Congrats and no matter what you pick....ENJOY!
