Because I'm not wearing it right?
It's the wrong size?
I have weak/bad shoulders?
I wondered if my sling was a bit too big. I wore it out today with LO for about half an hour while I ran some errands at the mall. I still think perhaps it's a little big.
My shoulder (the one taking the weight) started to ache. Is this a size issue?
I don't really want to pursue getting a smaller size if it's something I might not use much because it doesn't suit my body.