thanks for that its defiantly made my mind up, I'm happy to stay on the comfort and colief. i actually rang the cow and gate helpline about the formula for advice, as he was only taking 2 ozs mainly at feeds with gaviscon and colief and was starving by 1 1/2 hrs later, she advised me that the gaviscon was making him tired and filling him up short term but leaving him hungry after the hr, and stopping him taking more ozs! she said to see what he would be like with just the comfort and colief (as I told her he was still spitting up with the gaviscon and it made no difference at all to his reflux!) so today i did not add the gaviscon and now the last 4 feeds have been so much better instead of taking 2 ozs he took 4 to 5 ozs and has been totally different, his naps have been longer and hes more content and has been going 2 1/2 to 3 hrs, I cant believe it, plus his spitting up is exactly the same without the gaviscon so i wont bother in future! iv also been using the dr brown bottles (as recommended by other mums in posts)with the colief and taking out the gaviscon, ive seen an immediate change, i just hope hes not having a good day and it carries on, il have to see! The main thing is he seems happier and not in so much pain (I think he has colic and the colief is defo working, cross everything don't want to jinx things!). I'm so glad i did not go down the aptimal 2 route and thank you all for advising me not too" hurrah for this brilliant website!