You don't pay for a 2 year old on the dining plan; they aren't included. At buffets they eat from your plate, and the same at regular meals, though of course you can order food for them and pay out of pocket.
At all the buffets we went to with a 2 year old, he got his own plate and drink. You can fill up their plate with whatever they would like to eat. They are free. If you do a TS meal that isn't buffet, they will have to eat off your plate but they will give you a plate for them. They will sometimes give you a drink for them at no cost though.
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