Shoulder hurting bad - from picking up baby?

Bri

My shoulder is in so much pain. I’m 90% sure it’s from holding, rocking and picking up my 7 month old. I try to alternate arms but it feels very awkward to me to hold him on my right side (plus then I lose my dominant hand to do stuff)

It hurts and is sore:( anyway, is this normal? Any mommies out there deal with this? And how can I get this taken care of and feel better?

Any help is greatly appreciated