Hi everyone, just wanted to update how we are going.
We have now been on the size 3 teats for around 2 weeks fully. Before this we would offer a size 3 first and then if it was too fast for him we would swap back to 2. Took him a while to get used to it but he seems pretty happy on them now. Oh we still use size 2 teats for the DF though as he seems to gag cos he is asleep and relaxed!
Thanks for everyones advice