My DS has been on C&G comfort milk for 6 weeks as per recommendation from HV as when he was 7 weeks old he had thick green poop and had terrible colic and just in what seemed to be excruciating pain when pooing with normal formula 
not to mention only pooing every other day….
after about 10 days of being on C&G, he was fine although still had green poop but no pain!! 
This past week, he’s gone back to arching his back when he feeds, thicker poops and generally being unhappy, he’s now 13 weeks old and is in the throes of teething..
Has he become immune to C&G comfort or is it to do with his teething?
TIA x