Hi and welcome to YT! Congrats on your new puppy! 6oz is a pretty big, healthy pup!!... he/she may grow to be 6 pounds or over.
My Penny had
one pup a few years ago.... she never got pregnant again after that(

).. I had her spayed this year.
My other yorkie females average 4 pups in a litter.
Best of luck with your new addition.... pictures please!!!!