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Menstrual period is a natural occurrence and with that an authentic manifestation of the forces of nature inside humans, i.e. woman. First menstruation, which denotes a period of fertility, among girls is called menarche and in its beginning it is pretty irregular i.e. unstable which clearly alludes to certain parts of the Bosnian folk calendar. Namely, in the period from February 14th (exactly at noon - highest point of the sun) until March 14th, also until noon, the reign of Veljača (February) lasts, an extremely unstable period of winter, when according to folk belief bura (gale) north and south wind are fighting. Right after it comes the seven day period called Baba (Grandma) which is similarly fickle, unpredictable and often extreme - snow can fall during the day, wind blows and then the sun appears suddenly, etc. Both names Veljača and Baba, perfectly describe the maturing process of a woman, hormonal cycle, pre-menstrual syndrome, which finishes with Did (/Grandpa/ called by our elders Did Grgo) which comes right after Baba, Did is "good natured since inside him resides the harvest of potato!" If we agree that a potato resembles a testicle and that the laying of seeds in the earth is an act of fertilisation, then we can easily come to a conclusion as to why after Did comes a period of nine days, during which, every three days, there is a change of restless and playful beings, i.e. children, which are called by our people Stablići, Kablići and Štapići. In almost all traditional stories of our people there is mention of three sons which are the main actors in the story. Similarly, I think it's not necessary to especially emphasize that nine days represent nine months of pregnancy. It is interesting that the entire cycle extends to February, March and ends at the beginning of April when the unstoppable awakening and proliferation of nature occurs.
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Folk calendar is actually a calendar of agriculture and as such follows the natural cycles which manifest through old deities of the Bosnian cult of fertility and with that it is its only authentic example.