Hello, my lo is 4 months now and has just been put on Pescription milk, he's been unsettled since birth with reflux and fusses on bottles a lot sometimes cries on them, he's seen doctors and hv and has just been prescribed this milk. First time trying it and he's no better taking his bottle, in face it was worst. Took an hour and only got 3oz down, he usually takes 4-5 and can only feed him in his bouncer chair. If he does have a CMPA would I expect to see a difference straight away on how he takes the bottle or will it take time?