Little Arthur Cox was on his way home from nursery with his grandmother and older brother when he was hit and fell underneath a vehicle at the junction of Ferndale Road and Old Shoreham Road, Hove.
His grandmother Sharon Maher said she feared the worst as she looked on with Arthur's five-year-old brother Archie.
The driver did stop at the scene but Arthur's mother Emily Tingey is calling for him to come forward as he has not been seen since the toddler, who had been on his scooter, was taken to hospital for the night.How many names here? I'm losing track!
The 26-year-old said: "It's hard to think someone could knock down my baby and not ring to find out if he is alright.
"There has not been any contact from them and it could have been a whole lot worse."Maybe this is a warning not to let granny mind the kids near the road?
A police spokesman said: "We are appealing for the driver of a car who stopped to assist a small boy who had been in collision with his vehicle in Hove to make himself known.
"The driver stopped and is reported to have called an ambulance, but a passer-by offered to drive the boy to hospital."So can't you trace him via his phone number?