The baby was taken to hospital by ambulance crews but later died, said police.
Emergency services were called to Seatrade House in North Station Road in Colchester, Essex, at about 6.15am on Tuesday, after concerns were raised over the welfare of the child.The death is being treated as unexpected and is being investigated.
"We were called to a property in North Station Road, Colchester, by colleagues in the ambulance service shortly after 6.15am on Tuesday following concerns for the welfare of a baby. The five-month-old was taken to hospital, but has, sadly, died.
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