Hi, my husband found 4 orphaned kittens and brought them to me to take care of. I think they are now about 6 weeks old. They are doing great and developing well except for one kitten. It is much smaller than the rest and is not eating solid food like the rest. I also noticed that it's anal area is now very swollen and irritated and I had no idea why until I noticed another kitten suckling on this kitten in that area. No matter how many times I take it away from this kitten it always goes back. I know that the sucklilng is a normal behavior but it is hurting this poor kitten. Is there anything I can do? Thanks in advance.