Hi! My guess is he's going to get bigger. Oscar was 5 mo. old when I got him and 6 lbs. He's now almost 9 mo. and 9 lbs. He's seemed to have almost stopped in his growing now, and I think he'll top out at about 10 lbs. Your little one has several months of growing to do yet. I was hoping for a slightly smaller Yorkie when I got Oscar, but now I wouldn't trade him.....