I’m not saying baby monitors are the only reason for improved SUID rates. I’m saying they likely played a role. Despite your sarcasm, you might also be right that lead could have adversely affected unexplained infant mortality. The point I was trying to make was that baby monitors are not useless devices designed to extract money from you as implied by OP, whose comments by the way, were anecdotal.

$400 is excessive though. As is a subscription.

And data on SIDS is freely available. www.cdc.gov/sids/data.htm