Hi! I'm currently caring for a mama with 6 2-week old kitten fosters. 5 are own her birth cats and 1 is from another litter (from the shelter with a mama cat that didn't survive). He had 3 other littermates that didn't survive either. And, while he's hanging in there, I just can't get the "extra" kitty to gain weight. He's been at 165g for literally an entire week (so scary). He's active and strong (fights off the others during feeding time), has been feeding frequently and even developing (eyes fully open, ears up, etc) but no gains. I've tried to add additional KMR (via syringe -- but he won't take very much), have tried separating him from the others during feed time (but mama won't have it). Any suggestions?