Hello, Product size measurements are as follows: 6-7 year old size is not available. The smallest size available in our product is 7-8 years, and our available sizes are 7-8 years, 8-9 years, 9-10 years, 10-11 years, 11-12 years, 12-13 years, 13-14 years and 14-15 years. 7-8 years old measurements: Length from shoulder is 53.5 cm, side length including belt is 75 cm. You can choose the size your child normally uses. If you are between two sizes, you can consider the next size up. We wish you pleasant shopping.