Mistakes, or behavioral economics for babies

Young children aged between two and four years believe that you only
have to hide your head to become invisible – if your legs are on view,
it doesn’t matter, you still can’t be seen.

That’s according to Nicola McGuigan
and Martin Doherty who say this is probably because young children
think of ‘seeing’ in terms of mutual engagement between people. It
explains why kids often think they can’t be seen if they cover their
eyes.

Here is further discussion.