I’d think that if a baby is properly secured in a car, as it should always be, the driver should never risk the lives of anyone in or near that car by allowing themselves to be distracted. If there’s an emergency, with a baby or otherwise, you pull over asap.

I always took that particular bumper sticker to be some odd flex by parents, as if reproducing was some rare and impressive achievement.

I'm not entirely sure about the motive of baby-on-board other than potentially "if there's an accident look for the baby". I don't think it's an excuse to be a bad driver but hopefully encourage people around possibly to be mindful

I've seen quite a few stickers on cars that basically state there's an autistic child/person in the car and they have a list of things the passenger may exhibit such as being non-verbal, reacting strangely, running away... Like on some houses they list occupants human and otherwise in case of emergency and people and pets need to be rescued