That's a good idea, I hadn't thought about clawing training for the kittens. My kittens leave at between 6 and 8 weeks, and don't get into much trouble at that age, but if momma cat uses a cat tree I bet they'd be open to it in their new home. I have a litter of three at the moment, they were born Nov 24, and just starting to get around. One of the three is about half the weight of the other two, so that's concerning. I've started finger feeding her wet food, and she's gained a bit. Once before I had a runt, and the SPCA took her to a kitty ICU where she died within a day, so this one is staying with her family. I sincerely believe that removing a young kitten from mom and home is such a blow that it could very well cause death. Anyway, my runt gets gushy food and snuggles twice a day, plus her regular momma love.