Baby won't settle

Ok, so my gorgeous bubba is now 5 weeks old, but we are still finding it really hard to put her down..she just won't do it..will last about 10mins max and then squirms and cries until she is held..!! Refuses to go in her crib at night, so we are reduced to taking it in turns at night time to put her on our chest and let her sleep..!! She is formula fed and has gripe water because she suffers from colic, she is winded and from what I can see not uncomfortable with it..so I don't think that's the problem..any ideas or advice..?? Pleaseeee