I think we've given up on making J sit in the high chair. She wants so much to be like her big sister and sit in a big chair with a booster. Lately she's been throwing her plate and cup on the floor a lot and trying to put it up on the big table instead of on her tray... So tonight I gave in and brought the portable booster in from the car to try it out. She sat so nicely and ate her dinner and didn't throw anything on the floor throughout the entire meal. I'm not ready for her to grow up yet, but I will do what I need to to get through dinner without a huge mess.