Thanks everyone! I truly appreciate your concern over my child's weight.. or my ability to use a scale.
I hope you guys don't stop feeding your children based on a curve.
@BertieBotts, thanks for the reasonable answer. I'm gonna look into those suggestions, I was just worried about insurances and stuff with the label only saying 36kg. He has been using the car seatbelt for quite a while in the current seat, but I'm going for a isofix and usage of car seatbelt (so that the chair is stationary when he enters the car).
@hmmimnotsure: Yes I'm sure.
@SouthernComforts: We don't live in by charts, we nourish and exercise.
@BaronessBomburst: Yes, I'm sure about the weight, I know he's close to 135 but I still feel he's not ready to leave a seat just yet (there is a bit of a gap as BertieBotts noted).
Just a thought for future reference, if my child was obese, or struggling with weight, asking for a carseat recommendation is not the scene I would turn to for advice on my child's weight..
I'll leave you with a "off-the-charts, check those scales" kid carrying a set of footballs to go to his requested extra workout of the day..