No, they understand object permanence just fine. Peekaboo is fun because fun is fun. When doing peekaboo the other person is paying attention to you, and often

No, they understand object permanence just fine. Peekaboo is fun because fun is fun. When doing peekaboo the other person is paying attention to you, and often smiling and being relaxed. They laugh just as much if you play ‘peekaboo’ without actually covering your face ;)