Give infacol with every feed to start with. Colief works differently to infacol as they have different active ingredients so I’d stick with the infacol for a week or so at every feed before changing
I would definitely try probiotics x
Colief and infacol done nothing for us, colief actually made his tummy worse: we find dentinox was our saving grace! He’d also on a cows milk allergy formula as at 13 weeks started developing the symptoms and now he seems like he’s digesting his food much better whereas we were really suffering before. The “ILU” tummy massage was really helpful for him too alongside the usual bicycle legs and warm baths with warm compress on tummy x
Poor little mite, and you. Any chance he has an intolerance?