US Size Guide. Polo Assn Series Baby
 We recommend you to choose the older age, the closest to the child's age!
 If the baby is 6 months old, the recommended size is 6-9 months or 6-12 months (website product size: 9 months or 12 months) & if the child is 2 years and 5 months, the recommended size is 2-3 years (website product size: 3 years). 
| Age | Height | 
| 0 - 1 Monday | 56 cm | 
| 1 - 3 months | 62 cm | 
| 3 - 6 months | 68 cm | 
| 6 - 9 Monday | 74 cm | 
| 9 - 12 Monday | 80 cm | 
| 12 - 18 Monday | 86 cm | 
| 18 - 24 Monday | 92 cm | 
| 24 - 36 Months | 98 cm | 
| 3 years | 98 cm | 
 
 Shoe Size Guide
| Size | Length Foot | Recommended Age | 
| 17 | 10 cm | 6 - 9 Monday | 
| 18 | 11.4 cm | 9 - 12 Monday | 
| 19 | 12 cm | 12 - 24 Monday | 
 
 US Size Guide. Polo Assn Big Series Girls
| Age | Height cm | 
| 23 years | 98 | 
| 34 years | 104 | 
| 4 - 5 years | 110 | 
| 5 - 6 years | 116 | 
| 6 - 7 years | 122 | 
| 7 - 8 years | 128 | 
| 8 - 10 years | 140 | 
| 10 - 12 Years | 152 | 
| 12 - 14 Years | 160 | 
| 14 - 16 Years | 165 | 
 
US Size Guide. Polo Assn Big Series Boys
| Age | Height cm | 
| 23 years | 98 | 
| 34 years | 104 | 
| 4 - 5 years | 110 | 
| 5 - 6 years | 116 | 
| 6 -7 years | 122 | 
| 7 - 8 years | 128 | 
| 8 - 10 years | 140 | 
| 10 - 12 Years | 152 | 
| 12 - 14 Years | 160 | 
| 14 - 16 Years | 165 | 
Useful information 
 
 Chest
 Measured under the arms, in the most prominent area of the bust.
 Waist
 Measure in the thinnest area of the waist, above the navel.
 Hip
 With the legs close together, measured in the most prominent area of the rear.
 Inner sole measurement
 On the floor, take a sheet of paper and place your bare foot on it, draw the outline for both feet and measure the length in centimeters. The larger size of the foot is taken into account .