Ba wani asiri ba ne cewa a zamanin yau ma'aurata sun fi sanin hankali game da jima'i na jaririn nan gaba. Har zuwa yau, akwai hanyoyi da yawa don tsara jima'i na yaron da ba a haifa ba. Waɗannan hanyoyi suna samun cigaba. Mafi yawa daga cikin wadannan hanyoyi suna ƙirƙirar mata da kansu.
A yau, hanyoyi da kakanninmu suka yi amfani da mu sun zama abin ba'a da abin ba'a a gare mu. Alal misali, ƙarni da yawa da suka wuce mutane sunyi imani cewa idan, a lokacin yin aiki na aure, sanya gatari a ƙarƙashin matashin kai, za'a haifi ɗa, kuma idan akwai guduma, akwai yarinya. Har ila yau, idan a cikin aiwatar da haifar da magaji wani mutum yana da suturar manya, sai a haifi ɗa.
Hanyar zamani na tsara jima'i na yaron da ba a haifa ba an nisa daga waɗanda suka rigaya. Yanzu suna da tushen kimiyya. Ƙididdiga yana ɗaukan jigilar kwayoyin halitta, abincin da ake amfani da shi kafin da kuma lokacin daukar ciki, kuma, ba shakka, ƙungiyar jini na iyaye masu zuwa.
Mata na yau da kullum suna shahararren ra'ayi ta hanyar hanyar kalandar. Wannan hanya ta dogara ne akan lissafi da kalandar. Hanyar kalanda ta dogara ne akan gaskiyar kimiyya kuma a mafi yawan lokuta zasu taimaka wajen hango tunanin jima'i na jariri ba a haifa ba.
Ta yaya yake aiki? Duk abu mai sauki ne. Kowane mutum ya san cewa jikin mace yana aiki cyclically. Babban aiki na wannan tsari shine maturation daga cikin kwai da shirye-shirye don hadi. Wannan ake kira ovulation. Harkokin mata a cikin mata yana faruwa kusan a cikin kowane mako. A kowane ɗayan ne. Mafi lokacin da za a yi juna biyu shine kwana biyu kafin yin jima'i da kuma bayan mako bayan jima'i. Dole ne ku ƙidaya daidai kuma ku ƙayyade tsawon lokacin da kuka yi. Amma wannan shine farkon dukkan lissafi.
Kamar yadda aka sani ko daga aikin makaranta, jima'i na yaro ya dogara ne akan irin yadda masaratai zasu hadu a lokacin hawan kwai. Haɗin halayen chromosomes XX shine ga yarinyar, kuma XY na ƙananan chromosome ga yaro.
Kira bisa tushen hanyar kalandar don yanke shawarar jima'i na yaro a nan gaba ya dogara ne akan ka'idar ilimin chromosome viability. Ka'idar ta ce Y chromosomes, wato, maza, sun fi sauki, amma basu da karfi. X chromosomes, a akasin wannan, sun fi damuwa, amma sun fi maida hankali. Idan jima'i ya faru a kasa da kwana daya kafin yin jima'i ko nan da nan bayan shi, to, tunanin mutum yana yiwuwa 80% na faruwa. Wannan shi ne saboda, kamar yadda aka ambata a sama, cewa yatsunin Y ne mafi sauki. Idan jima'i ya faru fiye da rana daya kafin matuƙar kwanciya, ko kuma bayan kwana bayan an yi amfani da shi, to, yiwuwar samar da yarinya ya karu.
Don gaskiyar wannan ka'idar, masana kimiyya sun zo ta hanyar bincike mai yawa. Bayanin da aka samu daga wannan binciken ya tabbatar da mu dangane da jinsi tsakanin yarinyar da jima'i lokacin da aka fara tunaninsa.
Yanzu bashi da wuya a lissafta ta hanyar kalandar, lokacin yarinya za a yi ciki, kuma lokacin da yaron yake. Ka tuna, saboda wannan hanyar babban abu shine ainihin ma'anar ranar jima'i. Don sanin ƙayyadadden lokacin yaduwa, kana buƙatar saka idanu da canje-canje a cikin zafin jiki, ku kiyaye tsarin fitarwa. Amma a yau akwai tafarkin da ya fi dacewa don sanin maturation na ovum - waɗannan su ne gwaje-gwaje don ovulation, wanda za'a saya a kowane kantin magani.
Idan tsarin jima'i na mace yayi daidai a tsakiyar kalandar sake zagayowar, to ana iya ba shi shawara mafi sauƙi don tsara jima'i na jariri ba a haifa ba. A cikin shekaru marayu na rayuwar mahaifiyar a cikin watanni maras ƙididdiga, kamar Fabrairu, Afrilu, Yuni, Agusta, da dai sauransu, yaron zai iya yin ciki. Kuma, bisa ga haka, yiwuwar samar da yarinya a cikin shekarun rayuwan rayuwa a cikin watanni masu yawa, kamar Janairu, Maris, Afrilu, da dai sauransu, yana ƙaruwa.
Tabbas, waɗannan hanyoyi basu bada cikakkiyar tabbacin ƙayyade jima'i na yaro ba. Tsarin mace a kanta shi ne tsari mai mahimmanci. Abubuwa masu yawa suna shafar ta. Idan kun je gwaje-gwajen, ya fi kyau kada ku sami hanyar kalandar.