I have a 3 and a half month old (No 2) who was waking through the night, although not hungry for a feed. I use a dummy and have for the last 10 days just been putting the dummy back in when he wakes (some nights it has been 10 or 12 times until he puts himself back to sleep.

He slept through till 7am last night uninterrupted for the first time. We also did this with no 1 and we have about 1 week of trying before they get the idea!