I dont have advantage in front of me, but I think the small one is labeled for cats over 8 weeks and under 9 pounds, then the next one up is for cats over 9 pounds. I would re read what it says. If not, Revolution has one thats for kittens over 8 weeks and up to 5 pounds.
well actually it says 10 weeks up to 9 lbs, so I think it will be ok, I didn't want to do it while I wasn't at home though or without another opion, thanks much