Children don't actually NEED electronic entertainment of any kind. Kids lived that way for a very long time.
At what point this becomes necessary is a matter of much argument. They certainly don't need it in the first few years, but I'd suggest they need to be at least aware by the time they are going to school.
It is difficult to separate this from entertainment, because being entertained/interested/curious is largely how our brains do some of their best learning at early ages.
> Kids lived that way for a very long time.
Be careful with appeals to tradition.
The world doesn't exactly work the way it did a long time ago, so we are not preparing kids for the same life they were expected to experience back then.