Harvie is 10 years old and wears size 8-9Y
Renzo is 5 years old and wears size 4-5Y

Garment measurements by size (approximately):
Size (cm) 18-24 2-3Y 4-5Y 6-7Y 8-9Y
Length 44 45.5 50 55.5 59.5
Front Chest 42 44.5 46 52 56