A young child is responding to treatment after being airlifted to hospital in a critical condition.
The emergency services were called to Forest Drive, Colburn, just before 5pm on Friday.
The child was airlifted to hospital by the Great North Air Ambulance Service.
North Yorkshire Police confirmed that a child was taken to James Cook University Hospital in Middlesbrough.
A spokeswoman for North Yorkshire Police said the child had suffered a head injury thought to have been caused when they collapsed.
The force added: “Paramedics and police were called to a house on Forest Drive in Colburn at around 5pm on Friday after reports a 19-month-old baby boy was seriously ill and required urgent medical attention.
“The baby was taken by air ambulance to James Cook University Hospital where it is believed he is responding well to treatment.”
A spokesman for the family said the boy had suffered a reaction to his medicine but was now breathing on his own and was on the road to recovery.