Due to my sons excessive spitting up (already tried reflux medicine) our doctor suggested adding 1 tsp baby cereal per 2 oz of expressed breast milk to thicken it. I chose organic oats over rice due to the news above small traces of arsenic in the rice cereals. Anyway being a ftm I was confused and frustrated as even the fast flow nipples (dr Browns) wouldn't allow the expressed milk w oats to pass through. We took old nipples and cut a slit at the top (took a few tries) and it was either chug or nothing for our guy. Does anyone have other suggestions ????? Thank you !