Archie is 8 years old, 130cm tall and wears size 8-9Y
Caius is 5 years old, 110cm tall and wears size 4-5Y

Garment measurements by size (approx):
Size (cm) 2-3Y 4-5Y 6-7Y 8-9Y
Length 48.5 60 70.5 76.5
Front Waist 22.7 23.7 24.8 26