Well Izzy is 2-1/2 and barely 3# and I get that comment all the time - and quite frankly sometimes you can't educate people. But my comeback is:
She's not teacup she is within Yorkie standards which is 3-8? not sure if it's 7 or 8.
No such thing as a teacup and leave it at that.
Good luck with your new baby - hope to see pics.