Yes, it is very scary to watch your toddler walk off the edge of a high adult bed. The only way to prevent this is to lower your bed. Bed rails or pillows will not do the trick. I am constantly telling parents to get rid of the bed frame for the first year or so and just sleep on the mattress. You should also start teaching your baby to slide off the bed feet first, on his belly – just like he goes down the stairs. It usually doesn’t take long for him to figure this out if you show him a few times.