From the present study devoted to the follow-up of 26 children (20 girls and 6 boys) having a tall stature, three major points have emerged: (1) an excessive acceleration of the speed of growth is characteristic of abnormal heights; (2) an endocrine disorder is responsible for the accelerated growth in 50 percent of the cases, and (3) when the cause cannot be determined or suspected by clinical examination, measurement of bone age is the first parameter to be requested.