@sf111 Screens in general – I don't draw a distinction because he only watches streaming apps either on the TV or on a tablet. We don't let him watch YouTube at all. As far as I'm aware he doesn't know it exists, and we plan on keeping it that way as long as possible.
Edit: He also plays games...
@sf111 That's our policy all the time. Our three-year-old can watch TV (within reason) from Friday after school until Sunday dinnertime, but that's it.