My 6 week old son has got colic. during the day he seems fine but at night he just lies awake grunting for ages going red in the face and straining eventually turning into a cry, resulting in about 3 hours sleep each night. He doesn't settle in his cot at all well the only way to get some sleep is to sleep with him on my chest which I don't want to encourage. how harsh should i be with him when leaveing him to cry (all depends on how much patience you have as well!!)