Ibu, colic is basically unexplained, regular crying (like I think they say at least 3 hours a day, 3 times a week)... they have different theories as to what causes it, like maternal diet and immature digestive system, I think it's basically related to their little tummies get very full and uncomfortable. Poor little Charlotte gets so distressed she won't feed or sleep and cuddling and soothing techniques were not working at all, she would cry and scream for hours at a time everyday and I could do nothing for her sad I got infacol drops from chemist and it's working well, she still gets a very hard tummy and I have to massage either the small of her back whilst she is lying across my arm or massage her tummy, eventually this makes her poo in a rather explosive manner and she calms down has a feed and goes to sleep!
Reading about all these June bubs having their 6 wk check ups, everyone sounds like their doing well (with the exception of usual newborn issues). I'm a first time mum and did not realise how demanding this would be, but I am getting those first smiles now, DD is 4 wks old... makes up 10 x over for the hard times!
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