according to their birth. Here, on the shoulders (the place of strength), all were borne up alike; but over the heart (the place of love) the order was "according to the tribes" as God chose them, Exodus 28:2.
Related Commentaries of Exodus 28:10
Exodus 28:10
10 Six of their names on one stone, and the other six names of the rest on the other stone, according to their birth.