Baby on Board sign mean,

"Stay out of my way, I'm yapping on the cell with other
mothers/expecting friends, I'm not paying attention to
the traffic around me and I'm speeding, putting my
baby in danger of not reaching her/his first birthday.
Don't you dare metion this to me because I will flip
you the bird and curse you out."

And then we're all surprised that most people don't
know how to drive.
How can they learn, when their parents set a poor example.

Louis.