Dd is combination fed with mostly formula. She was experiencing symptoms of silent reflux and colic regularly with a lot of wind. We were managing it as best we could by keeping her upright for half an hr after each feed and feeding little and often and giving infacol. We decided to try and change her formula from Aptamil to Hipp organic. We changed over two days ago. She takes the new formula no problem, however she has been really fretful and screamed for hours both evenings - more than she ever has before and it took ages to settle her in the crib. I’m feeling really concerned and unsure what to do for the best. Has anyone else experienced this? Should I stop the Hipp and return back to Aptamil or give it longer? How long does it usually take to notice any improvement. Thanks in advance for any help,