Good luck with it all. I'm not yet a mum, but I have bought the breathing monitors. We've actually gotten the Angelcare one for the cot and also a Respisense (a small one that clips onto their nappy) for when we're out and about.

When we were weighing up what to and what not to buy I thought it might be overkill to get both. But then I did a bit of reading and TBH it made perfect sense to me to have a breathing monitor with them whenever possible because sleep aponea (sp?) is common in babies. And, it doesn't just happen in bed, it can happen in the car, in the pram or anywhere that they're sleeping.

Yes, you can follow all the SIDS advice (but some bubs just wanna sleep the way they want and sooner or later they will be able to roll over to the position they want), you can check on them every ten minutes and you can have them sleep with you, but there is literally a 3 minute window (maybe less) from the time they stop breathing to when it's too late. I can't help but wonder whether or not you would notice that they had stopped breathing if they were asleep in the pram or the carseat, or even while you had them in bed, it's not like they will necessarily make a noise or cry, I imagine it may be a very silent thing that you wouldn't notice unless you were paying really close attention to them.

Anyway, that's just my opinion and what lead us to purchase the two monitors. Both of the ones we've got sound an alarm after 20 seconds, so you have probably a good 2.5 minutes to try and get them breathing again if something happens, but in most cases the shock of the alarm will be enough to wake them up and shock them into breathing again.