my baby girl is now 5 weeks old, over the past week everyday without fail at 6pm she starts to cry. She then stays awake usually untill 11pm at that point she falls asleep. She goes on and off the breast. i have tried walking around the house, swaddling her and various other things, but sometimes nothing works. She is otherwise fine, she sleeps well at nights and throughout the day.Could this be colic? has anyone else had similar problems?