My experience has been different from everyone else who has replied so far. DD started sleeping from 9-6 at 4 months old. For a couple of weeks initially she used to wake up once in the night. My husband went in to her room and put her back to sleep. She is 13 months now and still sleeps through the night though it is 10 - 7.30am. All through these months, I always nurse her just before I go to bed at 10.30-11. She sleeps through this feeding. I don't know if this helped her sleep through the night but it didn't hurt.
You can hope that your LO will not change her pattern but as you know, each baby is different and all you can do is wait and see :-)