Children's watch

Size method by age, birth date, hand measurement 10 cm, ring 3, from months to one year, hand measurement if slim 11 cm, full 12 cm, ring 3, from two years old slim hand measurement 12 cm, if full 13 cm, ring 3, and if full ring 4, from age 3 years to 6 years, hand measurement slim 13 cm, full 14 cm, ring 4, from age 7 years to 10 years, slim hand 14 cm, full 15 cm, ring 5, from 10 years to 15 years, hand measurement if slim 14 cm, and if full 15 or 16 cm, ring 6, and the best measurement is by meter, the correct measurement.