How to choose size？

Size 2
Suitable height: 95-105cm/（3’1″-3’4″） Suitable weight: 15-17.5kg / (33-38 lb)
Size 4
Suitable height: 105-115cm/（3’5″-3’7″） Suitable weight: 17.5-20kg / (39-44 lb)
Size 6
Suitable height: 115-125cm/（3’8″-4’0″） Suitable weight: 20-25kg / (45-55 lb)
Size 8
Suitable height: 125-135cm/（4’1″-4’4″） Suitable weight: 25-30kg / (56-66 lb)
Size 10
Suitable height: 135-145cm/（4’5″-4’7″） Suitable weight: 30-35kg / (67-77 lb)
Size 12
Suitable height: 145-155cm/（4’8″-5’0″） Suitable weight: 35-40kg / (78-88 lb)
Size 14
Suitable height: 155-165cm/（5’1″-5’3″） Suitable weight: 40-45kg / (89-99 lb)