Magnus is 4.5 months old and he's about 3.27 kg. There's a ups delivery guy that owns 3 yorkies and he said one of them is about 6.8 kg. I asked my vet if my puppy was over weight and whether I should put him on a diet. She checked him out and told me he's in a good condition right now so there's no need. Unless you're concerned about the whole "standard", you probably have nothing to worry about.