M.E.
As a mom the moment my daughter let food fall from her hand to the floor was the moment I started to teach her not to. You have allowed this behavior to begin and it will be hard for you to break. Just because she is a baby doesnt mean that she shouldnt learn manners and rules. If she tosses a toy a another child would you scold her or allow it? Same principal. You are the parent. You are the one to set the rules and what you will accept in behavior. If she continues to toss food then take the food away. She will learn. My daughter now when she is finished eating places all of her food that has fallen on her tray onto her plate and will hand me her plate and utinsels. She is 18 months old. She also wipes her hands and face with a towel. She does these things because from the beginning it has been taught. Remember, that as a parent you need to teach them how to be proper and productive adults and that they start learning from infancy.