stupid FTM question.... really need answers.

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My 4 month old is ready for rice cereal. She eats 6 bottles a day typical (I make all of her bottles the night before to help with her reflux and colic) when I introduce rice cerea will that replace one bottle? So if I give it to her in the morning she will only eat 5 bottles instead of 6 or will she still take 6 bottles?