Five nurses have been suspended from a hospital's children's ward after claims that a baby was restrained, according to reports.
Police and NHS chiefs confirmed they are investigating an incident at Scunthorpe General Hospital in Lincolnshire.
The alleged restraint of the infant is said to have taken place on the Disney Ward, which looks after children aged from a few days up to 16 years old, the BBC reported.
Wendy Booth, head of governance for Northern Lincolnshire and Goole Hospitals NHS Trust, said: "We can confirm an incident has occurred which the trust is investigating.
"We are keeping the family fully informed. It would not therefore be appropriate to comment further at this stage."
The NHS trust declined to confirm any details about what happened.
A Humberside Police spokesman said: "Police can confirm that a complaint is being investigated following an incident at Scunthorpe General Hospital.
"This is currently in the very early stages and police are working closely with the NHS trust to fully establish the circumstances of the case."