Vitamins to boost appetite?

Any info on this? even thought Elise's ped doesn't worry about her not eating I do. She just drinks like 2 Oz of milk, breast milk and maybe a tablespoon of rice with a half a meatball or any meat I make a day . And won't eat anything else!
how can this be ok?

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01/10/15
She has been taking Tri-Vitamins since she was born I don't see any appetite changes. Shes always been the same never interested in food. eats like a bird and only gains ounces or most of the time stays in the same weight for months.
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01/10/15
Do I need a doctors Ok for that?
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