I kind of experimented. If I gave him a big chunk, I'd sit with him until I was sure that he would bite off a piece and not shove it in whole. My daycare provider is much braver than I am and I take cues from her as well. I'd also remind him to chew up his pieces while he was eating. I'm sure my ds is at the stage where he can eat quarters of a sandwich now, but I'm so well trained to cut it up!!!!