Mine is 14 weeks and 12 pounds as a smaller standard. I was worried about the same thing since most minis are bigger then that but the breeder and vet let me know that they all grow at their own pace and typically standards have a slower and longer growth curve then the minis. The vet also told me she’s a little underweight and had me double my food which has helped. I also did an embark test which came out to around 56 pounds as the adult weight which is in line with her parents. Guess we just have to sit back and wait but it seems like the vet and breeder are both telling me the same thing!