No sign in Arthur slowing down.
It's his first day at the big school today, let's hope he has lots of fun. He's still in nursery, 1 year left after this term but it makes sense to put them both into the same school.
The average height for a 3 year old (he's 3 in a little over a month) is only 95cm, he's a wapping 1m! I don't have the exact data for Flo but she would have been around 96 / 97 cm at 3 compared to the average girl of 94cm. Not sure where they're getting the height from.
Flo's now 5.5, the average height for a girl at 6 is 115.5cm. Unless she stops growing she'll be a fair bit taller than that too.