My grandson is 6 weeks old and has terrible colic. He’s having Infacol before every feed but he’s still in awful pain and screams and sobs, pulls his legs up and goes rigid. It breaks my heart to see him like this and was wondering if we should change his formula. He also gets explosive diarrhoea which is sometimes frothy. The health visitor is unable to advise us, just saying to persevere. I’d be so grateful if anyone could help him.