Yep agree with the others.

DS1 was turned at 9-10 months under advice from the paed, he suffered from reflux and in the rearward facing position had trouble clearing his mouth. He was about 8.5kg and our seat only does 8kg. But I would have preferred him rearward longer.

DS2 was about 14 months and we turned him because he hated rearward and would strain his neck just to see forwards lol. We have a Prado so I'm happy to have him farward facing, he was 8.8kg when changed.