Well I had two kids who went everywhere with me, from their first few months until their early 'teens. I was a busy young professional, I worked around 65 hours a week in two jobs, I had all the cares of a young father trying to provide for his family while trying to maintain a reasonable work-life balance, money was tight, I was tired. But I never 'forgot' that my kids were in the car, and I never left them alone in the car - if I was out of the car, they were out of it with me.

I find it absolutely incredible (in the true sense of the word) that anyone should need a reminder sticker on their car's window. It's hardly Rocket Science is it? Common sense, behaving responsibly - that's all it takes.