May baby is 7 weeks old, he drinks his formula, and will burp after the feed, but then he will raise his legs to his stomach and looks like he is in pain, his face goes red and his hands come up to his face, after 5 mins he will vomit his feed, should I use colimex? Do you think this is colic or reflux? He is able to do a poo each day, the poo is fine not hard so he is not constipated.