It's not the planning that gets ya, it's the kids. (Insert Jaws music here.)
Cute display for first birthday. Cake on top for the birthday girl and cupcakes ready to go for everyone else.
A time capsule for baby's first birthday. Have every guest write a small note, or bring something small that reminds them of that year, and collect them in a time capsule jar for baby to open on his/her not so bab-ish 18th birthday.