I thought it was 6 months or 8kgs, whichever comes first. A little guy born a couple of weeks before Miss A was turned around about a month ago. He's a really big boy so probably made the weight, but I had such an enormous urge to rip his seat out and put him back rear facing. I did ask her (I hope it came across as kindly but concerned, even though I was feeling anything but kindly) and she responded by saying that her husband was sick of the front passenger seat being so far forward.