Baby reflux & cereal?

my baby is 6 weeks & constantly eating (pumped milk)..about 4-5oz every 2-3 hours and during the night. she's 10lbs! she has reflux so her doc said to try cereal with her milk. I read a lot of the boards about starting cereal & I tried giving her gerber oatmeal 1/4 of a teaspoon (just to start slow) mixed with 4oz milk.. I bought Dr.Browns Y , and it took her 1 hour to finish 2oz and was very fussy because she couldn't get the cereal out of the bottle. is there anything else I could try? any advice would be appreciated