Size guide

The size guide should be used as a guide as each child is unique. Also, there are slight sizing differences between brands and between countries. 

Generally we recommend that you measure your child's height and use this as a guideline along with the size guide below rather than just using your child's age to gauge the most suitable size.

Please rest assured should you purchase the wrong size you can return for free for all UK orders.

European  UK Sizes
56cm newborn
62cm 0-3 months
68cm 3-6 months
74cm 6-9 months
80cm 9-12 months
86cm 12-18 months
80-86cm 12-18 months
86-92cm 18-24 months
92-98cm 2-3 years
98-104cm 3-4 years
104-110cm 4-5 years
110-116cm 5-6 years
116-122cm 6-7 years
122-128cm 7-8 years
128-134cm 8-9 years
134-140cm 9-10 years
140-146cm  10-11 years


Founded in 2014, Mainio is a Finland-based brand creating sustainable childrenswear and womenswear. Mainio’s unique design philosophy lies in rich prints, surprising colour combinations, and relaxed looks. Their mission at Mainio is to create sustainable clothing that is boldly designed, well-made, durable and can be used and loved for a long time. They put sustainability at the core of everything that they do. Prioritizing sustainability means better and safer fabrics, ethical practices, and long-lasting clothing.

Mainio collections are always made with respect for the environment and its living creatures. Sustainability and transparency are at the most inner core of everything that they do. All Mainio garments are made from sustainable material, organic GOTS (Global Organic Textile Standard) certified cotton. The clothes are produced in Lithuania and India, in factories holding SA8000 certificate, which guarantees ethical production and living wages. Other two EU-situated factories (Finland and Estonia) are extremely reliable and have demonstrated their ethical working conditions. Woolen accessories are made with love in Finland from mulesing-free merino wool.

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