Size chart UK sizes
AgeLengthWeightSize
Baby Basics  0 - 24 months:   
Up to 3 months1ft 8in – 1ft 10in7 - 11 lbs50 - 56
3 - 6 months1ft 10in – 2ft 3in11 - 15 lbs62 - 68
6 - 12 months2ft 3in – 2ft 7in15 – 22 lbs74 - 80
12 - 18 months2ft 7in – 2ft 10in22 – 26 lbs86
18 – 24 months2ft 10in – 3ft26 – 31 lbs92
Basics for kids  2 – 8 years:   
2 – 3 years3ft – 3ft 3in31 – 35 lbs3Y
3 – 4 years3ft 3in – 3ft 5in35 – 40 lbs4Y
4 – 6 years3ft 5in – 3ft 10in40 – 49 lbs6Y
6 – 8 years3ft 10in – 4ft 2in49 – 57 lbs8Y

Size chart Metric sizes
AgeLengthWeightSize
Baby Basics  0 - 24 months:   
Tot 3 months50 - 56 cm3 - 5 kg50 - 56
3 - 6 months56 - 68 cm5 - 7 kg62 - 68
6 - 12 months68 - 80 cm7 - 10 kg74 - 80
12 - 18 months80 – 86 cm10 - 12 kg86
18 – 24 months86 - 92 cm12 - 14 kg92
Basics for kids  2 – 8 years:   
2 – 3 years92 – 98 cm14 – 16 kg3Y
3 – 4 years98 – 104 cm16 – 18 kg4Y
4 – 6 years104 – 116 cm18 – 22 kg6Y
6 – 8 years116 - 128 cm22 – 26 kg8Y