Emergency services dashed to the address in Garden City in Deeside, north Wales, at around 10pm on Saturday night. The two-year-old boy was taken to hospital but died on Monday night.
The death is currently being treated as unexplained by police, reports North Wales Live.
Officers are now working with partner agencies “to investigate the circumstances of the incident.”
“Police were called shortly after 10pm on Saturday night (14/8) by Ambulance colleagues, to an incident involving a two-year-old child at a property in Garden City, Deeside,” a spokesman for North Wales Police said today.
“The child was taken to hospital in Chester by Ambulance staff and then later transferred to Alder Hey Children’s Hospital, Liverpool, where they sadly died last night.
“The death is currently being treated as unexplained, and we are working with partner agencies to investigate the circumstances of the incident.”
The investigation continues.
Garden City is a village beside the River Dee near the England-Wales border.
It began as a planned community for workers at a nearby steel works.