
Before I started with a new toy breed, I read all I could on it, as I had only previously bred Toy Poodles and Yorkshire Terriers. According to one lot of research, any pup under 3ozs was not viable.
I had a litter born with an exceptionally weany girl that weighed two and three quarter ounces. It was a litter of 3, so plenty of nipples if she was going to live. For something so diddy, she has a suction like one of those plunger things. Feeding very well, and, although she is still only 400gms at 5 weeks, I think we are out of the woods. So, never say never!
Apart from checking that she can latch on properly, I have not given her any supplements, or treated her different to the 4oz pups.