11 month old ( will be one on dec 31) won’t eat

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My daughter is usually a great eater, will eat anything but the past week she’s been refusing to eat everything. Fruit, veggies, meat, cheese, crackers etc. idk what to do or just let it ride through. My 3 year old is very picky and it’s hard to get him to eat that he has to drink protein shakes advised by his doctor. I don’t wanna deal with another picky eater since she’s been so good. Anyone else go through this?