Daywear, pants, shorts, underwear, dress and sleepwear For example, if your child is between 60 and 65 cm tall, we recommend that you choose a 3-month size. If your child is over 65 cm tall, it would be better to choose a 6-month size to ensure greater comfort and a longer period of use. Age Stature 3 months 60 - 65 cm 6 months 70 - 75 cm 12 - 18 months 80 - 85 cm 18 - 24 months 90 - 95 cm 3 years 100 - 105 cm 4 years 110 - 115 cm 5 years 120 - 125 cm 6 years 130 - 135 cm 7 years 140 - 145 cm