None of my three children slept through the night consistently at 6 months, but every two hours is too often. It sounds like your baby is hungry. I highly recommend the book Super Baby Food by Ruth Yaron. I still refer to the book and my oldest is 7 1/2. Also, try putting your baby to sleep on her tummy. My first baby was probably a tummy sleeper and I kept putting her "back to sleep". Babies also digest better on their tummy. She is probably flipping both ways at this point anyway. You probably have already done this, but check the environment in your baby's room-make sure the air vent isn't blowing directly on her, no loud noises by her window, etc. Contrary to popular belief, only about 25% of all babies sleep through the night at this point. Also, definition of "sleeping through the night" vary greatly. Our first baby had such sleep issues (our second and third did not), that we had her sleep with us. I realize people have differing opinions on this subject one way or the other, but it worked and we all slept much more soundly. Every baby is individual and do what works for your family. Good Luck!