Wake up time...

is getting earlier and earlier
I just don't know what to do anymore, I tried putting her to bed earlier/later, whatever...she just won't sleep past 5:45 lately, and she seems hungry so I feed her and will not go back to sleep in crib...swing only and just for 30-45 min...
any advice whatsoever? How often do you find that your dc changed sleeping habits?
She is 7 months.