You babies are soooo cute! Actually, i didn't know what you meant by singleton haha until i started reading. My princess has had two litters. Her first litter, she only had one pup. I couldnt part with him, so i guess i have a singleton. Yes he did get a little bigger than the ones in her second litter, but its just that he has longer legs but cute as a button. He did just fine without litter mates. Although i do have him a little spoiled since he was the first one that my princess had. I kept one from her second litter also, thats how i ended up with 4 yorkies. Mom, Dad and two babies haha and wouldnt take the world for any of them. They are precious! No more babies for princess! or else i will have a house full