This is what my wife bought last year to address this [1]. It doesn't detect breathing, but it goes off if there's no movement for 20 seconds (from breathing).

This is what my wife bought last year to address this [1]. It doesn't detect breathing, but it goes off if there's no movement for 20 seconds (from breathing). It goes under the mattress and you calibrate it by draping a towel over the bed--it's that sensitive. It'll also act as a baby monitor (audio) and air temperature sensor. It is annoying when you pick up your child, you have to reach over to turn it off or the alarm will go off. We've never had it actually go off for stopped breathing, but we definitely sleep better. [1] http://a.co/4pdu0nI http://a.co/4pdu0nI