The boy was left at the Travelodge in Edinburgh in the midst of chaos caused by his parents' rush to attend a family party, the (Glasgow) Daily Record reported Thursday.
The parents quickly realized their mistake and returned to find the boy playing with toys in the hotel room.
"The couple were very flustered. They had lots of luggage to pack in their car and they were already late for a family party," a source at the hotel told the Daily Record. "It was a bit chaotic and they left the boy."
"They did collect him quickly but he is still counted as the strangest item of lost property we've had," the source said.
Other Travelodge locations also reported their most bizarre lost items of 2007. One Scottish location reported a suitcase full of wigs and glasses was left behind by a guest while other European locations reported an urn of ashes and a living Persian cat, the Daily Record reported.