Such little cuties they are! I still don't think it's a bad thing that they are 'suckling' on each other. I am sure it gives them a lot of comfort that they seem to need. It is really quite common (well, not uncommom anyway) that kitties who are very close to each other will do that. I am wondering why you are concerned about it....not trying to be disagreeable, just curious. Or to anyone else out there, is there something I am missing or don't understand about why this is a bad thing? I certainly don't claim to know everything. They are not physically hurting each other are they? What does your vet say?