At 3 months all my kids are still in 6 qt shoe boxes. I'd move him to a smaller space it might hel.p I had a het pied male that would strike at me, the mouse, and anything that would move. But he would never grab ahold of the food. So after about 3 weeks I started assist feeding him. After about 2 months he started eating on his own. He is about 100 grams and 4 inches shorter than his sis but he is still eating like a champ.