J.,
I assume that this is a baby shower? If not, I'm sorry, my suggestion is only for a baby shower. I have done this idea for a couple of showers, and it has been a big hit. I have gotten about 30 baby bottles,and nipples, not the big kind in the store, but the kind used in the hospital. I work at a hospital, so they are easily accessible to me, but if you were to go to a hospital nursery and ask for some for a shower favor, I'm sure they would be glad to let you have some, because usually these are given to the hospital for free, from companies like Ross and Similac. You could even offer to pay something for them, and they probably wouldn't take your money. Anyways if you're interested, here is the idea. I fill the little 2oz baby bottles with Hershey's brand Hugs, and Kisses chocolate candy. Then on the outside of the bottle, I tie a blue or a pink string with a little hand made card that says: Hugs and Kisses from Baby ???, if you know the baby's name, put it in. If not, you could put the last name. Hope this helps, and hope your favor is for a baby shower.
Good Luck, S. S.