The normal height of a boy 11 and a half years old is 143~153cm, which is related to many factors and needs to be analyzed specifically. 1. Boys’ height is related to a variety of factors, such as nutritional status, exercise, family genetics and diseases, etc. If the child does not have the bad habit of picky eating and partiality of food, moderate exercise, no influence on the growth of height of the disease and other factors, the majority of 11 and a half years old boy’s height can be reached 143 ~ 153cm. 2. If the height of 11-year-old boys is lower than 143cm, suggesting that the child’s height may be abnormal development, you need to take the child to the hospital child health department to improve the relevant examination, to assess the specific causes of the child’s height abnormality, and for the reasons to give timely intervention to promote the normal growth of the child’s height. Boys’ height is related to a variety of factors, if parents find that their children’s height is significantly lower than that of boys of the same age, it is recommended that they go to the hospital in time for consultation.