I suppose I'm just used to my adult mammals, noticeable growth there means something's wrong ;P

Although, I do have another question since everyone says to up the food size. He's nice and well rounded since I bumped him up to two weanlings, which is just hovering at 14% of his weight. If I bump up his food size again, to rats, wouldn't that be overfeeding him? I thought the general rule of thumb was as wide around at the pelvis, 10-15% of weight. Not that I don't think he'd take to rats right away, I'm switching him over once he's eaten through the rest of the rodentpro bag.