yep having the same problem with my bottle feeding boys they are probably about a month old haven't started weening them yet. i've had them for nearly 2 weeks because their feral mother abandoned them and seems to have taken off.. either that or something happened to her I just don't know. I asked the vet what to do he said to seperate the ones sucking on eachother. I also had the idea of using some anti-lick stuff ...tried 2 things so far bitter apple and fooey.... neither one seems to have had much effect but supposidly it works for some people. hopefully when my boys get a bit older and get weened they will grow out of it....