Right, I'm going to mark here. DS2 was born mid December and is, I hope, going through the fucking 4 month regression. 1am seems to be his time of "choice", and from here on in it is likely that he will rouse me ever hour/90mins through the night.
I'm bf, he's never slept through, but the last week has got worse and worse. I went against everything I wanted to do and gave him some porridge this evening. It's had no effect as he still woke at half ten and 1am (so far) - so I have no idea what to do next.
I had terrible pnd with DS1 (intrusive thoughts, hallucinations etc). I've had nothing similar so far with DS2, but on a night I'm starting to feel desperate 
He is almost rolling back to front (if only someone would move his shoulder), weight bears on his legs for AGES and has great strength in his back. He's lovely. I just wish he would sleep.
Oh, and I think he is teething. He's constantly chomping on fingers/dummy/cats tail.