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The law doesn’t say an age when you can leave a child on their own, but it’s an offence to leave a child alone if it places them at risk.
children under 12 are rarely mature enough to be left alone for a long period of time ‎· alf
children under 16 shouldn’t be left alone overnight ‎· alf
babies, toddlers and very young children should never be left alone ‎· alf