This happened with my first two babies too. I always carry them on my left shoulder, so my right hand is free (I'm right handed). Starting last night I noticed that my left shoulder is sore. It's from lifting up my arm to hold my baby on my shoulder. I'm trying really hard to use my other shoulder and hold him different ways, but I just automatically lift him to that sore shoulder.
Any one else dealing with something similar?

son#1 born 6/2010
son#2 born 4/2012
son#3 born 7/2014
Re: Shoulder hurts from holding LO