Who Is Obligated in ציצית. Containing 3 Se'ifim:
Even though [the verse] states "And you shall look upon it" (Numbers 15:39), a blind man is [still] obligated in ציצית since the [verse] of "that you cover with" (Deuteronomy 22:12) comes to include [a blind man]. And the verse of "And you shall look upon it" is needed to exclude a nighttime garment.
Women and slaves are exempt [from wearing tzitzit] because it is a time-dependent commandment. Rem"a: And if they wish to wrap [in tzitzit] and say the blessing on them it is up to them to do so as with all time-dependent commandments (Tosafot and the Rosh and the Ran, Chapter 2, Rosh Hashanah, First Chapter of Kiddushin). However, it looks as if they are doing it to appear more observant than others, therefore, they should not wear tzitzit, as it is not a commandment of the person [rather of the object] (Agur Section 27). [And for slaves] This means we do not have to buy him a tallit in order that he be required to wear tzitzit as we see in Chapter 19 it says when he has a shawl with four corners he should wear it.The requirement for a tumtum and an androgynous is doubtful and so they should wrap without a blessing (Explanation: a tumtum does not know whether he/she is male/female, and an androgynous has both male and female genitals).Rem"a: And since it is our custom that women should say the blessing when they fulfill time-dependent commandments so should they (Divrei Atzmo)
A child who knows enough to wrap in tzitzit must be taught by his father to wear them as part of his education. Rem"a: And in particular if the minor knows to put two tzitzit in front and two in the back (Notes of Maimuni Chapter 3) and knows to hold the tzitzit in his hand during the reading of the Shema (Mordechai, end of Chapter Lulav Hagadol).