Parental control

There is no parental control built into steam itself. How do you expect a baby to run a program on a computer anyway?

edit: Simple fix ,log off of your steam account when you aren't using it.

попробуй менять после выхода из игры расширение файла запуска c exe на любое другое, тогда игра не запустится, когда будешь сам играть- просто измени обратно

isn't there any parental control in windows itself?

Add them to favorites and toggle the list to only show favorites.
Anything else won't appear until you change it back to show all games or all installed games.

At the right side under links, there's a category menu. I never used it before but maybe it would do what you want to do?

Just create shortcuts in your desktop of the games that you want, so your baby can play them just by clicking in shortcuts without having to open the Steam window/library

u'r baby can use steam ??!!

I've heard that Game Nanny can be used :) It stores the info well hidden in the registry so nobody should find it
You can also chose which games can be played I think :)

Cheers

I've yet to see the issue with a baby playing L4D, to be honest. When I have kids, they're going to think that's the best thing since warm teat.