Yaaleh v'Yavo in Birkat haMazon on Rosh Chodesh

Hi,

Although, as we have noted, we try to have a special meal on Rosh Chodesh, there is no technical obligation to do so.

Therefore: A meal I eat on Rosh Chodesh is not truly a "Rosh Chodesh meal," and one who forgets to insert "Yaaleh v'Yavo" in birkat hamazon on Rosh Chodesh does not repeat birkat hamazon.

(Shulchan Aruch Orach Chaim 424:1; Mishneh Berurah 424:1)

Have a great day,
Mordechai