Hey there...I had a similar problem with Jack...then he hit 6 weeks and had no problem with sleeping in his cot during the day. An ECHN told me at about 12 weeks it was going to change and he'd be fine during the day...but thankfully it happened earlier. I can relate, it's a nightmare having to hold your baby to allow it to sleep during the day.

I developed a routine which I stick to. What I did was, as soon as he'd start to look remotely sleepy during a feed or any other time, I'd take him into his darkened, cool room, press play on the cd player (same music every time), wrap him up tightly, kiss him on the cheek and pop him in his cot. I wouldn't speak to him during this process. He'd protest a bit to start with...but it got to be less and less. He still carries on on the odd occasion, but because he's wrapped well, he seems to resettle well too if he wakes.

Hope it helps...and it WILL get better!