matthew started to sleep through at about 2-3 weeks. It wasn't done on purpose mind you, but it worked. I had felt a bit naff because I had a cold so when he woke at 3am as usual I gave him his dummy in the hope that it would last him another half hour at least, but then next thing I knew it was 6.30am and he woke up full of smiles. I was pleasantly surprised. For the next few nights i did the same, with the intention that if he didn't settle with the dummy I'd of course get a bottle, but after about 4 nights, he just didn't wake up any more for the bottle. He's 12 weeks on Sunday and I can honestly say that he hasn't woken up in the night once since then

Sorry if it sounds like I'm bragging

but my girls were nightmares at sleeping so i feel like someone is looking down on me
Hope that helps.
Naimi x