I said 6 mo. Tyler was a big baby and was showing all the signs of "readiness" before then, but he was happy and thriving on breastmilk and formula so I held off. In retrospect, I'm glad I waited. It was easier to fit solids into the day when he was older and had more awake time, and he didn't spend much time in the mush phase since he was closer to being ready for finger foods.