L.K.
I see that you're carrying your son a lot. Have you tried a sling carrier. It gives you 2 hands free and maybe you can give your wrists a break. I carried my kids well into their 2's. The over the shoulder baby holder is the brand that I liked the best. I tried a couple of others but they gave me a back ache for some reason. Also, no clips or awkwardness to get them in. Not as hot as the snugli which I also used briefly. It took only a bit of practice before I got the hang of it. At 24lbs I would do the position the baby on the hip and sling around the baby's bottom position. Check out the website, I think they even have videos now.
Good Luck,
LaurieK
www.mymonavie.com/LaurieK