Welcome to YorkieTalk!!!! Your babies are BEAUTIFUL and it sounds like Molly is the perfect little mommy to her sweet babies!!
I can see from the pictures why you wanted to keep all 4 - they are so sweet!!! And KUDOS to you for doing your homework on breeding!
Wouldn't it be wonderful if EVERYONE did years of research before trying to breed!
Your whole gang is just precious, keep the pics coming!!