A 3-year-old boy who had gone missing in Hamilton has been found.

The boy was wearing only a nappy when family believe he escaped out a window and went to the neighbour's house, the boy's aunt said.

Family contacted the neighbour and found the boy in the house.

The boy, who turns 4 next week, went missing from the Gillies Ave, Claudelands house about 2pm and was found about 2.45pm.

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His aunt said he was autistic which they believed was why he was so prone to escaping from everywhere.

"You could probably put him in a cage and he would get out."

She said the whole family was just relieved to have him back.