how much should a 3 month old baby be eating?

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my daughter Leanne just is 3 months(4 months on the 16th) and for the past 2 months shes been eating about 8 7oz bottles a day and one with rice cereal in it before bed, about a week ago, i started putting the rice in every bottle,because 7 oz didnt seem to fill her up, she would cry after each bottle she finished, but after every bottle with the rice, she would poop very diareah like and i mean right after each bottle with rice she would fart like the wet farts and it would be runny poopie...gross i know! so now i am not sure how much to feed her, but i stopped giving her rice in every bottle, now she only gets it before bed again, but now shes up to 9 oz and i am just wondering if thats ok to give her, or what i should do, i dont want to over feed her, but shes gets so upset like shes still very hungry and i feel like we are starving her...but i know we arent..im just confused, please give me some advice, this is my first baby and i wanna do everything the best i can :) thanks!