When you made your ADRs, did you specify that your 2 yr old had sensitivities? If so, it should be on your reservation and they'll know in advance. Still want to request it specifically, but they'll know ahead of time. If not, it shouldn't be a big deal, just mention it to your waiter/waitress. I'm lactose intolerant and I noticed that the counter services at the resorts had Silk Soymilk, which of course I didn't notice until the last day!!!