"More crashes happen less than 100m from your home, than anywhere else on the road," she said.
"As soon as you start that car, you're at risk so the first thing you should do is put your seatbelt on. It's there for a reason."
The regional council was also reminding parents to make sure their children's carseats were correctly installed.
Police, Plunket and Horizons had been staging three to four checkpoints per year in Whanganui where they were helping parents make sure seats were safe.
"The problem is people can buy child restraints online these days [with] no instructions. Quite often these seats are made for a particular type of vehicle," Leitao said.
"The good retailers will advise and will also take a return of a seat if it doesn't fit properly."
Call your local Plunket office for advice on how to install a child's carseat or to get it checked.