How long does the stage of na'arah (maidenhood) last?
Halacha 2 states that once a girl manifests the lower sign of physical maturity, she is a na'arah for six months; after those six months she becomes a bogeret.
Question 2
What is the status of a girl who reaches age twenty without growing two pubic hairs?
Halacha 5 rules that a woman who reaches age twenty without growing two pubic hairs is deemed barren (aylonit), and she passes directly from child to mature woman without the stage of na'arah.
Question 3
At what minimum length are two pubic hairs considered a valid sign of maturity?
Halacha 16 specifies that the hairs must be long enough to be bent in half with their tip touching their base. Hairs that can be cut with scissors but are not yet that long create doubt and are treated stringently.
Question 4
Whose testimony is accepted to determine whether a girl has manifested signs of physical maturity?
Halacha 20 states that inspection of a girl for signs of maturity is carried out by trustworthy, ethical women, and even one woman's testimony is accepted — an exception to the general rule excluding women's testimony, made here for reasons of modesty.
Question 5
What is the halachic status of a person who can hear but cannot speak?
Halacha 26 explicitly states that if a person can speak but cannot hear, or can hear but cannot speak, he is considered an ordinary person — only the combination of both disabilities (deaf-mute) limits halachic competence.