Double Ditto on what Julz has said!!
Connor had colic....and would cry from about 3 or 4 until bedtime at around 7 or 8 everynight....for about 3 months, but I swear it felt like a lifetime!! He was also super niggly and generally unhappy for most of the day otherwise....he never seemed settled....and in my opinion it had nothing to do with milk or cramps - it was colic in its purest form - ie. over stimulation....and at first it was difficult for me to judge that it was actually colic, because at the time, I had no understanding of over stimulation, etc. He outgrew it when he could handle more stimulation....but I do feel for your friend, because when he was just a tiny baby and all my friends were going on about the happy little bundles they had....mine seemed irratable all the time!!
Like Julz says...many people dont seem to like Babysense, but to me the book was a godsend - it helped me SO SO SO much....and I loved the book and learned so much from it. I referred to it all the time up until a year....and now I'm on to Toddler Sense as well - I'm a fan of their methods, for sure....for me, it works and was simple to understand.
Good luck to your friend!!
My beautiful baby boy, Connor Troy, was born on 20 March 2010 and my 2nd gorgeous boy, Cullen Reece, was born on 2 September 2011 - I am very blessed indeed