Reason why babies, kids, toddlers can see ghosts.. according to the adults are because they are still innocent and pure...
they are unaffected by society or influences of the world, etc.
at least thats what the adults say.. and thats why they can see things that we can't..
I've also heard taht if the babies/kids are cryin inside the house.. you can put nickels in each corner or one of the corners to stop the baby/kid from crying..same concept as wearin' a jade (keep you from bein' scared)