My feelings are that these don't really offer that much protection. I figure that any toddler who can work out how to open the shutter mechanism isn't going to have much problem simply removing the blank first. At best they provide a reassurance to parents; at worst, I wonder whether somebody might fit these and then not be so careful about watching baby because they think he can't do anything to hurt himself.

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My baby cousins put just about everything that would fit into the VCR.. including toast !
I've heard stories of kids trying to insert peanut-butter & jelly sandwiches just to see what sort of picture they'd get! [Linked Image]