A man and a woman have been arrested over the death of a four-month-old baby.
The baby was reported to have stopped breathing at a house in the Dalton area of Huddersfield on Sunday morning.
Police and paramedics attended and the child was later confirmed dead at hospital.
A man aged 44 and a 31-year-old woman arrested in connection with the child's death have been bailed pending further inquiries.
A post-mortem examination will take place this week to determine the cause of death.
In a statement, West Yorkshire Police said: "Detectives are continuing inquiries to determine the exact circumstances of the death."