Usually the newborn baby’s foot length is about 8cm, half a year old boy’s foot length is below 12cm, girl’s foot length is below 9cm; 1 year old boy’s foot length is about 12.5cm, girl’s foot length is about 12cm; 2 year old boy’s foot length is about 14cm, girl’s foot length is about 13.5cm; 6 year old boy’s foot length is about 18.5cm, girl’s foot length is about 18cm, when the child grows to 15 years old When the child reaches 15 years old, the foot length is basically the same as the development level of adults. Generally, the development of children’s foot length is positively correlated with the development of height, and as height grows, foot length also grows gradually. From the relationship between foot length and age curve, it can be seen that the growth of foot length peaks when girls are 5-7 years old and 9-11 years old; when boys are 5-7 years old and 11-13 years old, the foot length growth peaks; when girls are 13-15 years old, the foot length basically stops growing; when boys are 16-18 years old, the foot length stops growing. However, after the foot length stops growing, the metatarsal circumference continues to increase, which is in line with the law of human morphological development, that is, the length first, then the width, until the adult. In addition, a common saying in life “children with large hands and feet will grow taller”, this statement is not based on science, children’s height and the length of the hands and feet in addition to genetic factors, but also with the diet and nutrition is adequate, whether regular exercise, as well as daily routine has a certain relationship.