TIL it takes up to 12 months for a baby to understand the concept of "object permanence" - the idea that an object continues to exist when it is out of sight

https://en.wikipedia.org/wiki/Object_permanence#Stages



Submitted March 21, 2015 at 06:23PM by autonova3 http://www.reddit.com/r/todayilearned/comments/2zsv5v/til_it_takes_up_to_12_months_for_a_baby_to/