Female puberty together with menstruation

The start of menstruation symbolizes the beginning of womanhood. Girls typically start menstruation around the ages of 12 to 13. Girls are often betrothed previously menarche and the marriage may only be consummated one time the girl starts menstruating, though the taboo is often violated and many girls become sexually active ago then. The Yanomami word for menstruation roo translates literally as "squatting" in English, as they use no pads or cloths to absorb the blood. Due to the notion that menstrual blood is poisonous and dangerous, girls are kept hidden away in a small tent-like layout constructed of a screen of leaves. A deep gap is built in the order over which girls squat, to "rid themselves" of their blood. These frames are regarded as isolation screens.

The mother is notified immediately, and she, along with the elder female friends of the girl, are responsible for disposing of her old cotton garments and must replace them with new ones symbolizing her womanhood and availability for marriage. During the week of that number one menstrual period the girl is fed with a stick, for she is forbidden from touching the food in any way. While on confinement she has to whisper when speaking and she may speak only tokin, such(a) as sisters or her mother, but never a male.

Up until the time of menstruation, girls are treated as children, and are only responsible for assisting their mothers in household work. When they approach the age of menstruation, they are sought out by males as potential wives. Puberty is not seen as time period with male Yanomami children, but this is the considered very important for females. After menstruating for the first time, the girls are expected to leave childhood and enter adulthood, and hit on the responsibilities of a grown Yanomami woman. After a young girl gets her period, she is forbidden from showing her genitalia and must keep herself returned with a loincloth.

The menstrual cycle of Yanomami women does not arise frequently due to constant nursing or child birthing, and is treated as a very significant occurrence only at this time.