Our kids clothes are labelled by age. However, you may find measurements such as height to be a more accurate guide. 

International Size Guide for Children's Clothing

UK	Europe	US	Australia
12 m	80 cm	12-18 m
18 m	80-86 cm	18-24 m	18 m
24 m	86-92 cm	23/24 m	2
2-3	92-98 cm	2T	3
3-4	98-104 cm	4T	4
4-5	104-110 cm	5	5
5-6	110-116 cm	6	6
6-7	116-122 cm	6X-7	7
7-8	122-128 cm	7 to 8	8
8-9	128-134 cm	9 to 10	9
9-10	134-140 cm	10	10
10-11	140-146 cm	11	11
11-12	146-152 cm	12	12