It's this use of a baby as bait which lies at the heart of an old urban legend where someone uses a recording of a crying baby to encourage people to get out of their cars, or unlock their front doors, or reveal themselves in some way while trying to help. Once they are exposed, our criminal does some kind of murder crime on them.
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"Stop! That's illegal!"
Although there doesn't appear to be much evidence to support the reality of that urban legend, similar cases have sort of, kind of happened. Like this story of a baby stroller left in the middle of the road in Fresno, possibly as bait. Although, again, in that case no actual crime appears to have been committed, and experts remain uncertain about whether that's just how people in Fresno store their babies.
But still, the "baby as lure" trick looks like it definitely could work. Even if you have no particular interest in extensively premeditated murder (except in self-defense), you could probably use this in a heist-like situation. Imagine a baby slid across the tiled floor of a museum, underneath a bunch of laser sensors, that suddenly starts crying, thus luring a guard out of position while the dad steals a massive diamond or just lies down somewhere for a nap. Since I thought of it, I can't imagine anything else.