The 12-year-old boy was not wearing a helmet when he was riding the motorbike on Woldgate
A 12-year-old boy riding a motorcycle with a three-year-old passenger has been seriously injured in a crash with a car in Bridlington.
Police said the vehicles collided on Woldgate, at 12:40 BST on Saturday.
The boy suffered serious head injuries and multiple fractures to his body. He was airlifted to James Cook Hospital in Middlesbrough.
The toddler sustained minor injuries and was taken to Hull Royal Infirmary for treatment, Humberside Police said.
The 12-year-old boy, who was riding a blue Yamaha motorcycle, was not wearing a helmet at the time of the crash, police said.
He is now in a stable condition.
Police did not say whether the three-year-old child, who was travelling as a pillion passenger at the time of the collision, was wearing a helmet.
A spokeswoman said she was "unable to give more detail" about the model of motorcycle, or the gender of the toddler.
The driver of the car, a 31-year-old man from Bridlington, suffered minor whiplash injuries.
Detectives have appealed for witnesses to come forward.