A.J.
I honestly just nursed my younger one while I spent time with my 2 yr old. I would just sit on the floor and be playing with my 2 yr old and have my newborn on my lap propped up on a pillow or held with one arm. I thought I had reached the peak of motherhood ability when I could nurse the baby and change the toddler at the same time LOL
As for colic, I'm all for baby-wearing! I preferred a snugli vs. a sling. I wore both my babies for several months. It was especially helpful with my 2nd b/c I could be outside playing with my 2 yr old, or walk to the park, or just do housework while baby was sleeping.