I'm not sure if this is any use. My 3 month old has just started sleeping through. For a few weeks before this he changed how he fed to every 1-2 hours during the afternoon and evening. Maybe adding/offering frequent afternoon/evening feeds would increase the time between night feeds - it's what he did for himself though, rather than anything I imposed on him - and I have no idea how long it will last (only a week or so so far).