I thought that a cot death meant that this remained unexplained. Now a baby monitor reduces cot deaths? I'm really interested to read about that claim.
"Angelcare voluntarily recalled 600,000 under-mattress sensor pads after two infants died of strangulation when the cord attached to the pad wrapped around their necks" - http://www.slate.com/articles/life/family/2014/02/mimo_and_o...
Strangulation by baby monitor is correlated with having a baby monitor.