R. Moshe Feinstein on When Women Must Expect to Become Niddot (22 Av)

אגרות משה יורה דעה ב:עב 22 Av 5722 (1962)

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R. Moshe Feinstein discusses whether a woman can assume she knows when she's not likely to become a niddah, even if other halachot suggest that she has to worry that she will. ​