My son just turned 2 and a half and I weighed him last night. He is 18.5kg and now too heavy for his current 5 point harness car seat. I do have another car seat I could use but it would be using the 3 point seat belt instead of a 5 point harness. I did a bit of research and I think legally he has to be in a 5 point harness until he is 3.
I know there are a couple of rear facing car seats that will do up till 25kg but at a meter tall, his legs just won't fit rear facing. I did find one forward facing car seat but at a £600 price tag, that's a scary prospect for 6 months use!
Any help would be greatly appreciated