I think every baby is different - dd who is 4 months has slept from 8:30pm until 7am with no waking for the last week. (she sleeps in a cradle beside our bed) But then ds2 who was bottlefed was still wanting milk in the night until 2 months ago. ds1 never had a night feed from 8 weeks on. So with all 3 of them it's been different.