Actually, 13mos is about the age dd started refusing to let us spoon-feed her, so we just rolled with it and made a full transition to self-feeding. It's completely appropriate at that age. They will pick up on how to use utensils by watching you and dh eat. You just have to be prepared for messy mealtimes for a few months as they get the hang of it. In the meantime, if they still want "spoon" food like yogurts, pudding, puree, etc, offer it with crackers or other finger foods that are easy to dip.