Size guide for kids clothing from Marius Kids:

62 cm - 0-3 month
68 cm - 3-6 month
74 cm - 6-9 month
80 cm - 6-12 month
80 cm - 9-12 cm month
86 cm - 12-18 month
92 cm - 12-24 month
92 cm - 18-24 month
98 cm - 2-3 years
104 cm - 3-4 years
110 cm - 4-5 years
116 cm - 5-6 years
122 cm - 6-7 years
134 cm - 8-9 years
146 cm - 10-11 years
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The sizes are based on the child's height. The size of the child varies and the instructions below are therefore indicative.