There seems to be some room for innovation here. The police are throwing these things blind. Evidence? Well, I refuse to believe anyone, no matter how debased, would intentionally throw a flashbang into a baby's crib. What's needed is a flashbang that either won't go off if in close proximity to a living being (e.g. perhaps add an IR sensor) or a flashbang that is triggered remotely, so it can be thrown, spotted, and…
Read some stories of the Holocaust, then. They didn't have flashbangs, but there were cases of babies being killed by being repeatedly swung into brick walls.