> Nearly all of it.

Maybe you misunderstood me. I'm not talking about learning to understand spoken English.

You don't need hearing or vision at all to grow up to be intelligent (and able to write English).

What is your point exactly? Did you estimate raw amount of data received by people to make claims about data efficiency?

But you don't need millions of pictures of lions as a kid to know what a lion is.

Neither do CNNs, so I don't quite see your point. You are throwing numbers without good estimates. Get descent estimates for both children and NNs then make categorical conclusions.

Better even measure in bytes. And remember that kids look at video, not at individual pictures (even if these are videos of pictures).