Sefer HaMiddot, Conception; Pregnancy, Part II
Can copy this into an AI, or connect the whole library to your assistant. For deeper learning, you can directly use the original seforim, sites, and apps.
א. אִשָּׁה שֶׁאֵינָהּ יְכוֹלָה לְהִתְעַבֵּר, תַּבִּיט עַל הַסַּכִּין שֶׁל מִילָה אַחַר הַמִּילָה.
The aleph bet book, translated by Moshe Mykoff. New York: Breslov Research Institute, 1986
A woman who cannot conceive should look at the circumcision blade after it has been used.