It depends on many factors, one does the child have interest in in food if, do always give him food to eat by him self starting from eight months. Like my son now he will be 3yrs by June but he didn't like eating he has no interest in any food except chips and that is the only thing he eat by himself if he wants to eat other foods he will eat it like 9month old baby bcos he doesn't want it
Depending on the child, it's not something you can give a time bond, but what I noticed from past experience was that between the 10th and 13 months my kids are usually independent, that's if you don't mind the mess thou!just try to be around to see for yourself and allow He/she to flow....