I now fully understand WHY you should choose a reputable breeder & WHY breeders should keep puppies until they are at least 12 weeks old.
I knew that was what was recommended, knew the reasons behind that way of thinking, but never really fully "got it". After bringing home LuLu, I get it now. I've brought home 6 week old pups from BYB in my lifetime (not yorkies) & they were always scared, and didn't adjust well for weeks or months. But my LuLu hasn't missed a beat since coming home at 14 weeks.
She isn't timid or shy, isn't scared at all, & hasn't cried at night...she has adjusted much better than I could have ever dreamed!
I know some of this could just be due to her personality, but I fully believe the way she was raised & the fact that she was allowed to stay with mom & littermates so long really prepared her for coming home to us. I couldn't be happier with how she's transitioned & how well behaved she is. I am so lucky to have such a wonderful baby girl.
Just wanted to thank YT for helping me with my research.