Do you think babies/children can see ghost/spirits

Skye • Sidney-24/01/2016 Teddy- DUE 29/11/2017
I keep catching my son look at nothing with an intense stare then start laughing but he follows his eyes around the room like he is watching someone.
I keep hearing strange cries through the monitor when he isn't crying or anything when he is asleep ? 
I think his late grandad and great grandad is watching over him 😰😇😱👻

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