The growth pattern of length varies for infants of different months of age, with the first year showing the fastest growth at about 25cm. The younger the age, the faster the growth. The first year of growth of about 25cm, the first three months of length growth of about 11 ~ 13cm, but the second nine months of increased length and the first three months is about the same, 1 year old length of about 75cm; the second year of length increase of about 10 ~ 12cm, 2 years old after the growth of about 6 ~ 7cm per year, if less than 5cm for the decline in the growth rate. The growth of body length is influenced by endocrine, intrauterine growth level, genetic and other factors more obviously, short-term nutritional status, diseases will not affect the growth of body length, if the growth rate decreases should go to the hospital in a timely manner, with the help of professional doctors to take reasonable measures.