There is no easy answer to that question!
The "standard" is to be under 7 pounds. However, some grow to be much larger then that.
Chances are at 5 months old, your baby still has more growing to do- mine continue to grow and fill out until they were about 10 months old. You really have to look beyond your yorkies parents, further in the family tree, to get an idea of how big they will really be.
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