Ok I have 2 little greys that are about 6 wks or so. They were under wieght when I got them a week ago. One was 49g and the other 52g. They are gaining weight and look healthy. I've been feeding them the 5% of weight in formula and they have only gotten up to 79g and 72g. I was wondering if I should go up to the 7% to see if that helps them put on more weight. They are healthly just small.