birthright

birthright
n privilege or property which a person may claim because of birth or status 由於出身或地位而可以享有的特权或财产; 与生俱来的权利
    The estate is the birthright of the eldest son. 长子对这份地产有继承权.
    (fig 比喻) Freedom is our natural birthright. 自由是我们的天赋权利.

牛津英汉双解词典