He's going to get bigger, but it's hard to gauge exactly how big or little any puppy will be, i've attached a picture of my mom's yorkie's the first one is Max he weighs 5.5 pounds, the second one is Mazie she weighs about 13-14 pounds. They are both wonderful dogs.
The third picture is my little Lucy she weighs 3.9 pounds right now and is 4 months like I said, she just got a haircut and had to be shaved
Have any pics of your pup?