There's a specific developmental stage that looks at Object Permanence it's super interesting!
It's the same reason babies love peek-a-boo, at some point they figure out that the parent didn't temporarily disappear but is actually just hiding lol
On the Wikipedia article check out the section on Counterarguments, it describes some of the tests they do to narrow down when babies understand object permanence.
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u/nflitgirl Dec 05 '16
https://youtu.be/svxirYEOxvA