when a person is born his lower legs are small and weak so he is not able to move on them. when he grows up his lower legs become strong and his hips become very large. this is one of the characteristics of a person. the reason for this is that a person is erect and stands on his feet only so he needs his legs and feet to be very large in relation to his body as a whole so he needs the organ that supports them to be strong and large.
إن الإنسان في أو ل ولادته تكون أسافله صغيرة ضعيفة فلذلك لا يقوى على الحركة عليها، فإذا كبر قويت أسافله، وعظم وركه جدا وذلك من خواص الإنسان. وسببه أن الإنسان منتصب القامة، ويقوم على رجليه فقط فاحتاج أن تكون ساقاه وقدماه عظيمتين جدا بالنسبة إلى بدنه بجملته فيحتاج أن يكون العضو الحامل لهما قويا عظيما.