Hello. We had 2 newborn (2 days old) infant kittens come into rescue last night (they were without their momma since early that morning). The male weighed in at 117 grams and the female at 79 grams (she is tiny). We have another cat that was brought to us pregnant a few months ago. Her kittens are 6 1/2 weeks old, and weening right now. Momma cat lays around and lets the new babies nurse whenever I'm in their room, however I do keep them in a large tupperware container so that the 6 1/2 week old kittens can't get to them. Momma cat can easily jump in to nurse them if she wants to. My problem is, I don't know if she hops in and nurses them when I'm not in there with her. The kittens seem to have nice round bellies and are strong and vocal. She seems attentive to them when they fuss at all. My question, should I be supplement feeding them with kitten formula, or just monitor if they are gaining weight from momma feeding them when I'm not around. I don't want to overwhelm their tummies, but I don't want them to go hungry either. Any advice would be greatly appreciated!!