im moving joshua onto cow and gate comfort as he is currently on hungry baby formula(cow and gate)but he is wanting a bottle every 2hours but can only take 3-4oz. the normal stage 1 cow and gate made him really sick,i think reflux so gonna give the comfort ago. *sorry running on* it says on the side of tub tht they suggest to use either variable flow teats or singlehole medium or fast flow teats. im using avent bottles and the teats have 2 or 3 holes depending on the flow. am i best to use the aven vari flow teats? what teats do you use?