You really won't know...especially because he's a mix of lines. He could've gotten more of his mother's genes or more of his fathers at this point your guess is as good as anyone else's. I remember my boy topped out at around 9-12 months. He was still very skinny but I don't believe he's really grown in height since then. Probably has gained about 20 lbs since then with his chest puffing out and bones filling out a bit. Now he's 85 lbs. His father was 100 lbs, mother was 60. Mother's lines were all smaller (within standard) and so he's more like them.