I have a six week old myself and am currently going through the same issue. Recently,as bad as this may sound, i have started to let her cry for about ten minutes or so during the day. I dont mean cry like when she wants or needs something, i mean cry when she is bored or restless (i can already tell the difference) Amazingly, it has worked, for the past three nights in a row, she has slept most of the night! Before this, she would sleep all day and be awake all night!! I mean literally all night, from 11pm to about 9 am or so!!!! My husband just went back to work so i became desperate to get her to sleep being as my husband works nights and has to sleep days. So, i have her day and night!!! During the day, i have to get my errands done and at night well, i have to sleep! So, i was really desperate to get her to sleep!! Bottom line, try to keep your baby awake during the day,play with her, walk with her, change her outfits and play dress up, whatever it takes to keep her up. Even if she gets a little fussy from not being able to sleep, thats okay because she will sleep at night like she is supposed to. Good luck!!