Love your show Ben,
I am a Veteran, current Police Officer and father of 2 and I had this idea a few years ago. Kind of a gag gift if it could be marketed.
Just a methane sensor that attaches to baby's diaper that when it detects large amounts of methane an audible and visual alarm goes off.
Have an audible message like "This is not a drill! This is not a drill! Stinky incoming!" or something along those lines.
And maybe have a spinning police like red and blue led flasher that attaches.
Could not be marketed I don't think, because it would be too costly, I was looking up such methane sensors and they were 50 bucks or more from what I remember.
Anyways just another one of my many useless invention ideas.
Cheers,
-Andrew