Matthew Poole and continuators on Exodus 2:6

6 And when she had opened it, she saw the child: and behold the babe wept. And she had compassion on him, and said, This is one of the Hebrews children .

This she might very probably guess both from the circumstances in which she found him, and from the singular fairness and beauty of the child, far differing from the Egyptian hew, and she might certainly know it by its circumcision.