Wow, that sounds like True Lies.
I have carried an officer's 1911 in a Diskman waist pack that had CD in big letters (compact disk, not Charles Daly).
With child #2, I carried a second gun and spare mags in the diaper bag. Later I carried diapers in the map pocket of my vest and found that diapers do a great job of hiding the outline of just about any handgun. I my case, it was a full-sized 1911.
Of course, for diaper-related concealed carry, you sort of have to have the kid along to complete "the look."