Lilac,
Mine consider sleep thru, it started since almost 8 weeks old. mine is 10 hours baby. He Has to sleep fr 10 hours but by 8 hours, he will make a bit of noise. So if he sleep at 10pm, no night feed, but if he sleep at 9pm or b4, he will awake ard 5.30am. but training him to sleep from today onwards, see how it goes.