see this is the exact issue.
Charlie weighs 13 lbs I have both small and x small the SMALL I will have to wrap around him like a burrito and I dont think it will be tight enough to serve the purpose not without becoming uncomfortable from all the wraps of material. and you are right there is a BIG diff between xsmall and small. the small seems to fit him "picture wise" but doesnt fit where it needs to on his body for its purpose (if that make sense)
I just wanted to make sure I was using it correctly and it does seem that the xsmall is going to be the way to go. I am going to keep watching this thread though to see if there are any others with this issue and what they have done. thank you for your posts BTW this is such a nice group to come to