Someone mentioned that signs of that nature help first responders at the scene of car crashes, etc. Actually, they don't, because we ALWAYS search for other occupants both in and around the vehicle. I have attended two MVCs in which the sign was there, the driver unconscious, and no baby to be found. So, we searched, searched and searched s'more. Both times the baby wasn't ON BOARD. And hadn't been that day. The sign was there, though.

It's like PETS LIVE HERE signs on doors. One fire we searched, but later in talking with the house owner the pet had died years before. He still had the sign.

If you have a child(ren) on board, drive carefully. I think people with that sign would be seriously miffed were I to report the vehicle to police if I didn't see a baby on board while the sign was bobbing around. "Uh, 911 (999 in the UK), I'd like to report a missing baby . . .".

Anyway, I hate the damned things. The signs, not the kids.