How old is the puppy you are looking at, right now? Breeders try to predict weight based on their knowledge of the dogs they are breeding, but it's not guaranteed. So unless the puppies are older it's hard to know exactly how big they will be. I wouldn't make my choice solely based on predicted weight. IMO, Go with the dog you like best and whose personality will best fit your household.
My last yorkie was 5lbs. My kids were 3 and 5 years old when I got her. She was a perfect family dog and my kids adored her.
My current yorkie was predicted to be 6-7lbs and she's 10lbs!
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