I think that if they are very close by and can be seen, it’s not such a problem. If not, it takes less than one second for a child to get into serious trouble when unsupervised. You have to know the child, his/her maturity level, and how safe that back room really is. Personally, I would not leave kids unsupervised at this age. I have seen 4-5 year olds left in charge of infants OUTDOORS, and it troubles me greatly.
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