They are bigger, and 7 months is not a baby. I have two 2011 balls that were born this summer that are eating rat pups like crazy with no problem, which are bigger than rat fuzzies. My female albino that was born last month is eating hopper mice...I think you should seriously consider at least trying a rat fuzzie. They may look big to you, especially compared to the hoppers, but I can guarantee that he will take it. If he doesn't take the rat, try scenting it with a mouse (I haveto do this to switch from mice to rats). Do you feed live or f/t?