Officers were on routine patrol when they noticed the youngster.
When they stopped the driver, they found two children in the rear seats and one in the front and none were wearing a seatbelt.
The driver was reported for using a motor vehicle in a dangerous condition due to the manner in which the passengers were carried.
This is a £100 fine and 3 points on the license.
The driver had to arrange for a taxi, with child car seats, to come and collect them.