My DD's will be 3 and a half when this baking bub will be born. Rather than buy new baby seats we'd like to use the ones we have for the twins and get booster seats for the girls. They are 12 kilos now so by then should most definitely be at minimum 14 kilo weight.
My question is do all booster seats need harnesses and need to be anchored and up until what age? I know the laws have changed in the past few years.
Any advice would be appreciated