“Child Restraint System / Booster Seat”

My son is almost 3 years old now. I was moving to a new place a few weeks ago, and I took the car seat out of the car as i was moving some things in it. Once I was done, I went to pick up my son and forgot to put the seat back in. Luckily no one saw my son in the back seat and reported me. I saw the video below before so I wasn't worried and my son looked pretty comfy with real seat belt))

Very interesting video on child restraint systems / booster seats:

I was actually looking for regulations on booster cushions, what age and weight are they allowed to be used from? I only found that booster seats are only allowed/required from 18 kg to 36 kg.

There was a big story on booster seat a little while ago in the media. Apparently the seats are not safe and the government knew it and concealed the information. Youll have to do a Google search to dig deeper on the story. I didnt follow it but recall hearing about it.