Hi STM, trawling way back on this thread, saw your concern about cot death. Take a look at this site on baby monitors.
The motion sensor monitors (such as the "Hi Sense" brand) are recommended if you have cot death history in the family, or if you just want extra peace of mind. This is the brand used in some hospitals around the world (apparently premature babies have a higher risk of cot death).
My husband got us one while I was pregnant with DS, and I thought it was crazy, but he was very insistent. It was lovely to see the little green light flashing away reassuringly to show us the DS was sleeping and nothing more sinister was happening.
We got the Hi Sense brand - the one with the little elephant on it in the picture(there are others and some of them have problems giving false alarms, but we didn't have any problems with ours).
However, when DS was about three months old the alarm went off to say he had stopped breathing. By the time I got to him (DH said I ran like the speed of lightening) he was blue! He was on his back, nothing was obstructing his face, but he was definately NOT breathing. I lifted him up and he was all limp. I must confess that in my panic I did give him a small shake, and he then gave a sigh and started wailing (and breathing!)
Who knows if he would have started breathing again on his own? Maybe he would have. But it was 3am and both DH and I were in a very deep sleep. We would not have checked on him again for hours. I do believe it saved DS's life and made things a lot less stressful for us because we didn't need to do our own checks on whether DS was breathing - the monitor (which works by having a pad under the cot/basinett matress) did that for us.
By the way, we had read all the literature and had ensured that DS had not been exposed to any of the known risk factors for cot death.
The only time it ever gave us a false reading was when DS learned (at 13 months) to stand in the minute gap between the pad and the edge of the cot - sounding the alarm and laughing his head off to see us scramble to attend. We stopped using it then (although friends of ours used theirs until their dd was 2yo).
Personally, I believe that this was the best investment we made. Our monitor is currently on loan to someone with a baby girl, but we'll be getting it back when our new baby is due. I would not be without it.
I know it is not for everyone, but just thought I'd let you know about it in case you hadn't heard of it. TBH, I had never heard of it until DH mentioned it and I thought he was mad at the time, but after DS stopped breathing like that I was so glad that we had it.