S.W.
Although I would never leave a baby in the car especially if crying. I have started a movie on the DVD player for my 4 & 2 yr old while I quickly browsed garage sales (also locked doors). I felt since I parked the car right near me & they were occupied & strapped in their seats in a locked car they were not in danger. Also I live in a very small town & I wouldn't do that in a bigger one. I know a lot of the people & it's a totally different situation than it would be somewhere else. Like other mothers have said I have no where to drop them off as their is not family around. It was a city wide garage sale too & cold weather so I was literally stopping every block. You could have just mentioned to the mother her baby was crying too, maybe she left her when she was sleeping? I think just simply mentioning that to the mother might have helped her realize leaving a helpless baby in the car is inappropriate.