To make sure you are ordering the correct size, please refer to the chart below. 
Please note that most Spanish and Portuguese brands come up quite small, so it's advisable to go up a size. 
If you have any questions on sizing please email us at hello@littleprincelondon.com
Age
Height
Waist
Weight
1-3 months
52-56cm
42cm
3.5kg
3-6 months
58-64cm
45cm
6.5kg
6-9 months
67 - 70cm
47cm
8kg
9-12 months
72-76cm
49cm
9.5kg
12-18 months
78 - 82cm
50cm
11kg
18-24 months
81 - 86cm
51cm
12.5kg
24 months
86 - 92cm
52cm
13.5kg