Growth Charts

I have just been looking at different growth charts, seeing where Sarah fits in and wondering what clothes size I should continue buying...
On Chinese Growth Charts she is in the 97% in weight, height, and head circumference!
On US growth charts she is in the 60% in weight and the 75% in height!
Right now I have 2Ts, 3Ts, and even some 4Ts. I am not really quite sure of what to be buying right now, we really hope to get her by November, according to the charts she'll weigh about 30 pounds and be about 37 inches by then... So, I'm guessing she'll be fitting a 3T just about perfectly, I'll bring some 2Ts and maybe even a couple 4's along also...just in case.