Pray tell us why you have the need to place baby signs in the back window. What exactly do you expect other road users to do? Are you hoping there will be shart intakes of breath and adulation that you can breed like a rabbit? Maybe you aspire to one of those vans with windows so that you can fill it with brats. Shall other drivers salute you as they pass by? Sorry but as soon as I spot these self-important smug sanctimonious signs I just laugh and take no special actions whatsover - you will still get carved up if you get in the way.