Hi, I am mainly breastfeeding my 10 week old but supplement with normal powdered aptimil (with colief in it) for one bottle an evening since he was 4 weeks. He has been mainly fine on this - a bit constipated and windy but we seem to have helped this with baby massage. For the last two nights he has been extra colicky in the evening and sicked up really thick, powdery gunge which he has never done before. He had his first immunisations two days before this started and we switched from tommee tippee bottles to dr browns to see if this helped his wind at around the same time. I'm pretty sure we didnt accidentally mix the feed up too strong as it has happened on two nights now. Has anyone else had this type of sick/any ideas what causes it - bottle change/immunisations? thanks