TT #86 · Parashas Noach · Seventh Aliyah · Passuk 11:30
And Sarai was barren; she had no child.
Torah Temimah points to Rav Nachman (Yevamot 64a) — Sarah was an aylonit.
E-Daf image — Yevamot 64a (size=3)
English: “She had no child” — Rav Nachman said: Sarah our mother was an aylonit, as it is said “she had no child” — she did not even have a womb.
Custom (diyuk from the doubled language of barrenness).
The extra phrase indicates a structural absence (aylonit); her later childbirth was miraculous and not a source for ordinary medical conclusions.