Great question! No, mamas will make as much milk as is drunk, as long as they have the nutrients available. We just need to make sure she has lots of calorie intake as obviously growing babies and breast feeding at once is a big energy toll. We will also supplement the second little of kittens with colostrum to be sure. It’s certainly not ideal, but it happens in the ‘wild’ and it’s significantly more stressful to seperate the two of them.