My 2.5 year old will ask for a snack, I will get it opened/cut up (like a yogurt, fruit, etc) and after its all cut up and on a plate then she says she doesnt want a snack afterall. She does the same at dinner....she ate all her shrimp the other night, asked for more, i get it all cut up and then she says she doesnt want more. So I feel like I end up wasting stuff. UGH. This is annoying! How do I get her to stop?