Hi, I don't think anyone can truly predict the final size of a dog. However, I think sometimes a good estimate can be given. I'm sure your dog is beautiful. Try not to worry over the size thing. My Trixie was a little over 3 lbs. at 7 months and now at 15 months she is just about 5 lbs. As long as their healthy, who cares what they weigh!!
Good luck with your baby!!