They're called sleep positioners. Safe'n'Sound make one, so do "the First Years" (which is the one I have). I still use it.

Daniel did the same thing as your DS at about the same age. I did this and it worked, you can try it and see how you go.

I wrap Daniel under his arms (so his bottom half is wrapped and his arms are still free). Then I put him in the sleep positioner (which you don't necessarily need, it's just what I have) and put him on his side, facing away from me - the important thing is facing away, so there is no eye contact. I stick his dummy in and while holding his shoulder firmly (so he remains on his side despite his best fighting efforts) I pat his back. I do this for about 10 minutes and if he is still upset, I'd pick him up and cuddle him for 5 minutes, talking to him nicely so he would calm down. Then I'd do it again. I'd find that after about the third go-around, he'd fall asleep. Daniel also had a dummy, which I would put back in when spat out.

If, after the third time, he doesn't go to sleep I'd take him out of the room and read him a book in a quiet place with dimmed lights until I saw him rubbing his eyes again. I came to the conclusion there's no point in flogging a dead horse (so to speak), if he wouldn't go to sleep, there was no point in me upsetting him further (to be honest there were times I was so tired, while he was crying so was I, so I was getting upset too) - it's all about relaxing him.

It is to the point now that when I put him in bed (by wrapping his bottom half) that he rolls himself over on to his side and goes to sleep. Something I have also noticed is that he won't sleep anywhere else except his cot (Eg: won't sleep with us holding him or in our bed). So, with persistence - A LOT - we have succeeded.

My only problem now is that he wakes up at 5am!!! All very well if you're a rooster, which I am not.

Try it and see how you go. Although, someone else may have come up with some better advice. I reckon it's just matter of taking the time out and relaxing the baby - which is really hard and sometimes futile, but it will pay off in the end.

Rant ended.