Hello, I have had my baby rat for about for three weeks now. He is on soy based human formula and I recently went from feeding him every 2 hours around the clock to every four hours and once at midnight. But for the past week he has stayed 8 grams, Im pretty sure he is supposed to weigh much more by now. He is very active and loves to eat, he grooms himself regularly and other than that seems very healthy. I just need some advice and how to get him to put on a few grams. Should I feed him more at each feeding or feed him more often? I read feeding them more often can lead to digestion issues so please help if you can! thank you! I included a video of him grooming himself after eating so you can see his size. He will be month old on Thursday I believe.