“Then they journeyed from Bethel. When they were still some distance from Ephrath, Rachel was in childbirth. She had hard labor. When she was in her hard labor, the midwife said to her, ‘Do not be afraid. For now you will have another son.’ As her soul was departing, for she died, she named him Ben-oni. But his father called him Benjamin. So Rachel died, and she was buried on the way to Ephrath, that is, Bethlehem, and Jacob set up a pillar at her grave. It is the pillar of Rachel’s tomb, which is there to this day. Israel journeyed on, and pitched his tent beyond the tower of Eder.”
I am not sure why they did not stay in Bethel. On her way to Ephrath, that is, Bethlehem, south of Jerusalem, Rachel gave birth to a son named Benjamin. This was a very difficult childbirth so that Rachel died. Israel, that is Jacob, buried her near Bethlehem and set a pillar on her grave. This is the only occurrence of Ben-oni, son of sorrow, because Jacob calls him Benjamin, as the twelfth child is born. Israel/Jacob moved to near the tower of Eder, which is further south near Edom.