My two were fifteen months apart when I had my repeat c-section and it went really well. Like the pp, I did *have* to lift DD at some points in time, but I would say ''jump'' before which helped a little, although trying to coordinate her jumping and me picking her up at the same time was a little hilarious looking. DH went back around the ten day mark too, and by that point I was feeling pretty good and went right back to my routine with no issues. I say just listen to your body; last night I tried to move DS from his sister's bed (he's 33 lbs) and couldn't because I could feel a tugging/pressure on my incision so I called DH in to help. Take it easy definitely but it can be done.
And like pp- two under two was amazing. A little hard at first, but now, the pay off has been incredible. Even though I have a boy/girl combo, they are seriously each other's best friend's and play so well together. Best choice ever to have them so close. :-)