If I'm not mistaken I think they stop growing at about 8 months, but they could still "fill out" some more.
Are you sure of his birthday? Maybe he is older than you think. My breeder is scatterbrained and said Uni was 8 weeks when she was actually 12. Also last vet visit the scale was wrong and we had to reweigh her.
Either way, I think the bigger ones are more sturdy, don't have to always to the yorkie shuffle, you can walk like a normal person. LOL
__________________  The T.U.B. Pack! Toto, Uni, & Bindi
RIP Lord Scrappington Montgomery McLimpybottom aka El Lenguo the Handicapped Ninja 10-12-12 
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