We had the same problem with our 9 month old. She goes to sleep at 6:30 or 7pm and sleeps till 6:30 or 7am. Our doctor told us that she could sleep 12 hours without needing to eat, so I would nurse her to sleep, then we let her cry till 6:30 or 7am. It was a rough couple of days, but now she sleeps ALL NIGHT LONG! its great! Even if she wakes up earlier (like 5am or so) we still make her stay in her crib till 6:30 or 7am. She will cry for 15 min or so, but then she will fall back alseep for 45min or more. If we get her up at 5am she is SO crabby all day. If we make her stay in her crib till 6:30 or 7am, she is wonderful! Good luck!