Ya'aleh V'Yavo on Rosh Chodesh

If you forgot (or are not sure if you said) ya'aleh v'yavo of:
Rosh Chodesh Ma'ariv 
Don't repeat the amida. This applies to both ma'arivs on a two-day Rosh Chodesh.
Rosh Chodesh Shacharit or Mincha 
  • If you forgot:  Repeat the amida of Rosh Chodesh shacharit or mincha.
  • If you are not sure:  Repeat the amida with the condition that if you had said ya'aleh v'yavo the first time, the second time is a voluntary prayer (tefilat nedava).
Note If Rosh Chodesh falls on Shabbat and you are not certain whether you said ya'aleh v'yavo at shacharit or mincha, you must repeat the amida without a condition.
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