Rosh Chodesh reminders
- No laundry
- No cutting nails, hair
- Eat festive meal
- Yaleh Veyavo in Davening
- Yaleh Veyavo in Bentching
- Tehillim with commentary
- Blow the Shofar on the first day of Rosh Chodesh for practice. Every day thereafter blow Tashrat-Tashat-Tarat after Shacharis.
- Recite the three extra Kapitlach of Tehillim per day, after Davening, starting from the second day of Rosh Chodesh.
- Recite Ledavid Hashem Ori in Shacharis, after Shir Shel Yom, and in Mincha, before Aleinu, starting from the 1st day of Rosh Chodesh until Hoshanah Raba.
Melacha/work on Rosh Chodesh:
A. The law and custom:
It is permitted to do work on Rosh Chodesh. Nevertheless those women that are accustomed to refrain from working are doing a proper custom. [Practically the widespread custom today amongst women is to refrain from work on Rosh Chodesh. A woman may not be lenient against following this custom. All women must refrain from at least some form of work even if they have not seen in done in their family.]
B. What forms of work are to be avoided?
Those who refrain from doing only some types of work and permit doing other types of work may do in accordance to their custom. [Practically the widespread custom today amongst women is to only refrain from sewing, and other clothing related work, and laundering clothing.]
List of works that are accustomed to be avoided by women on Rosh Chodesh:
May a woman turn on a washing machine?
May a woman place the laundry in the washing machine and have her husband turn it on?
May a woman hang clothing on a drying rack on Rosh Chodesh?
 Michaber ibid; Shabbos 24a; Erechin 10b; Chagiga 18
 Michaber 417/1; Yerushalmi Taanis
The reason: The reason why specifically women refrain from doing work on Rosh Chodesh is because the women did not want to participate in the sin of the golden calf and hence abstained from giving their jewelry to their husbands. For this reason Hashem gave them this festival of Rosh Chodesh as a reward, that they would guard it more than the men. [Pirkei Derebbe Eliezer 44; Tur 417; M”A 417/2; Taz 417/1; M”B 417/3] Some explain that the three festivals correspond to the three forefathers while the 12 months correspond to the 12 tribes and when the 12 tribes sinned by the golden calf the Holiday was taken away from them and given to their wives. [Tur ibid in name of his brother Reb Yehuda] Alternatively the reason is because women have a similarity to the moon, as just like they immerse and return to their husband monthly, so too the moon is renewed monthly. [Or Zarua; Darkei Moshe 417/1] Alternatively the reason is because women are rooted in Malchus which has an elevation on Rosh Chodesh. [Shaar Hakavanos p. 76; Kaf Hachaim 417/27]
 M”A 417/3 that “one may not be lenient with them at all”; Biur Halacha 417 ”Vahanashim Nohagos”; Seemingly this would apply even according to the Michaber who merely claims it is a “good custom” and not an obligation, as once they accepted this good custom upon themselves it now has the status of a vow.
 Biur Halacha 417 ”Vahanashim Nohagos” based on many Rishonim [Shibuley Haleket; Oar Zarua; Rokeiach; Eshkol; Abudarham]
The reason: As to whether all women must accept the custom to refrain from work on Rosh Chodesh, from the Michaber it is clearly implied that only if one already has accepted this custom are they to continue, however there is no obligation to do so, and certainly one who has never accepted this custom has no obligation to now accept it upon themselves. However the Biur Halacha ibid brings a list of Rishonim that imply this is an aged old custom of women, and hence each woman today is obligated in following the aged old custom just like any other Minhag Yisrael.
rule the concludes that all women must at least keep the custom to refrain from some types of works. While one who was accustomed from young to refrain from all types of works must keep to their custom
Other opinions: As to whether all women must accept the custom to refrain from work on Rosh Chodesh, from the Michaber it is clearly implied that only if one already has accepted this custom are they to continue, however there is no obligation to do so, and certainly one who has never accepted this custom has no obligation to now accept it upon themselves.
 Rama ibid
 Sheivet Halevy 6/50 in name of Daas Torah that so is the custom today
Other opinions: Some Poskim rule it is permitted for a woman to sew on Rosh Chodesh and the prohibition is only to weave clothing. [Tashbatz 3/244; Shaareiy Teshuvah 417]
 For example it is forbidden for a woman to weave clothing. [Tashbatz 3/244; Shaareiy Teshuvah 417]
 Oar Letziyon 3/1-1
 Or Letziyon 3/1-1
 The reason: As the custom was only to refrain from doing actual labor, while simply pressing a button does not involve any real work. [ibid]
 Heard from Rav Asher Lemel Hakohen
 Poskim of today mentioned in the footnotes in Mishneh Berurah Oaz Vihadar 417; Heard from Rav Asher Lemel Hakohen
 The reason: As it does not involve any actual laundering on the woman’s part.
 Mishneh Berurah Oaz Vehadar in name of Rav Nissim Gerelitz
 Oar Letziyon 3/1-1