1 - Mesure the heigth of your baby
His height in cms from head to foot
2 - Refer to the following table :
Height
Size
45 cms
Earlybaby
50 cms
Birth
54 cms
1 month
60 cms
3 months
67 cms
6 months
71 cms
9 months
74 cms
12 months
81 cms
18 months
86 cms
24 months
94 cms
36 months
101 cms
4 years
108 cms
5 years