Aidan has been bugging me to measure him, so I finally hung up his tractor/big truck/digger measurement chart and he is now 48-1/2" tall. That means he's 10" shorter than I am and 12" taller than RB. Definitely a good sized boy. When we received his medical information in his referral, using growth charts, I estimated his eventual height at being between 6'1" and 6'2"-right where his big brother and his brother in-law stand. So far he's staying on that track.
Unfortunately for him, that also means that he could only ride some of the rides at the fair-he was actually too tall for some of the rides that other five year olds were riding on!