Question for all you mommys! Natalie has been eating cereal & veggies (I'm doing bananas tomorrow) for about a month…

Question for all you mommys! Natalie has been eating cereal & veggies (I'm doing bananas tomorrow) for about a month now. I know the formula is what is still most important so they say to give bottle first then 1/2-1 hour after give food. But my question is... should she still be getting a bottle every 3 hours? Last night I let her go 4 hours.