My 3 month old ds has been v colicky in the evening the last few evenings. He hasn't really been as bad a this before now. Nothing has really changed, he is ff (changed to f around 9 weeks due to various reasons i won't go into now and the transition was pretty smooth for him), he has pooped so not constipated. He is v agitated, sicking up small amounts, arching back, crying etc. Is there a developmental change around now? What could have caused this? the night before last he was distressed for 5 hours before going to sleep. I have restarted using Infacol after he seemed ok without it for a few weeks. Any tips to make him feel better gratefully received...