wow, I find that extraordinary your son is 120cm at 2.5 years!
My son is 127 cms and is 6.5 years old and he is the tallest (and always has been throughout his life) in his year One class. I cannot imagine a 2.5 year old at that height!
However my daughter is 2 years old and 86 cms so whilst she follows the 65 percentile, she does not follow in her brothers footsteps smile
Yes; he is a big boy! He's a little taller than his 7 year old cousin and about 4kg heavier. They're both healthy, active boys; just at totally opposite ends of the spectrum!
It can be a little difficult as people tend to assume he's quite a lot older and will often ask "what's wrong with him?" when he obviously doesn't have the developmental level they're expecting. We also have to keep his birth cirtificate on us to prove his age when we take him to museum/zoo etc. At least he'll never have the problem of not being tall enough to go on rides at the show tongue