Maxomorra use European sizing and all clothing is sized by length. The best way to chose the correct size is to measure your little ones height.
Alternatively we have a rough size guide for you below.
Size Guide:
1-2 months - 50-56cm
3-6 months - 62-68cm
9-12 months - 74/80cm
18-24 months - 86/92cm
3-4 years - 98/104cm
5-6 years - 110/116cm
7-8 years - 122/128cm
9-10 years - 134/140cm