[DanBC]

You must always have infants within eyesight. You don't need to be guiding them. But you need to watch them to make sure they do not discover a danger that you were not aware of.

English parents will spend time and money on plug guards - this is pretty much pointless because all English mains voltage plug sockets have in-built guards. An infant would need to insert something into the earth socket (to raise the guard) and then insert something into the live or neutral sockets. However, many parents with a flatscreen TV don't think to bolt it to a wall, and some children die from pulling the screen over on top of them.

"Heuristic Play" is a relatively modern concept where you give an infant a wide range of everyday objects (different textures, colours, sounds, etc) and then you just monitor for safety and let the infant explore.

There are very few occasions where it's safe to let a two year old be out of sight.