Amathuba ukuthi umfana noma intombazane azodalwa kusukela ekubukeni kwesayensi kuyafana. Kodwa kukhona "imithetho", okulandela ukuthi ungabeletha ingane yobuningi obufunayo, lezi zindlela ezisebenzayo ngaphambi kokukhulelwa.Ukuze ucabange ukuthi ingane ubulili zikhona nezindlela emva kokukhulelwa. Eziningi zalezi zindlela azikho isisekelo sesayensi, abanye ngokuvamile imibono yabantu kanye nenhlanhla. Into eyinhloko ukuvumela ukuzalwa kwengane ngokobulili obuhlukile kube yinto enzima, ngoba into ebaluleke kakhulu ukuthi uzalwa enempilo.
Okokuqala, cabangela izindlela ngaphambi kokukhulelwa. Indlela yokuqala yokunquma ubulili bomntwana ihlotshaniswa ne-ovulation. I-Y-chromosomes ihamba ngokushesha futhi ngesikhathi sokuvuthwa kuqala ifinyelela i-oocyte. Khona-ke amathuba okuzalwa komfana akhula. Ngaphambi kokuvuthwa kwegazi, izimo ezingalungile zenzelwe ama-chromosomes e-Y, futhi ziyafa. Ama-X-chromosomes afinyelela i-ovum futhi cishe ukuzalwa kwentombazane. Ukuvuthwa kwenzeka ngosuku lwesishiyagalolunye nesishiyagalolunye nesishiyagalolunye sokujikeleza kokuya esikhathini, okuvame ukuhlala izinsuku ezingu-28. Le ndlela yabonakala iyithembeke kakhulu ekusebenzeni.
Indlela yesibili ihlotshaniswa nokudla okuthile, noma ukudla. Ukuze ukhulelwe umfana, umuntu kufanele adle ukudla okunamafutha, kodwa ngokuqukethwe okuncane kwe-carbohydrate, lokhu kuhlanganisa imikhiqizo enokuqukethwe okuphezulu kwe-potassium ne-sodium, nokuqukethwe okuphansi kwe-calcium ne-magnesium (inyama ebhemayo, inyama ye-peach, amazambane, ama-legumes). Kule ntombazana, idinga inani elincane le-potassium ne-sodium, ne-calcium eningi ne-magnesium (imifino, imikhiqizo yobisi). Kodwa ngenkathi lokhu okuhlangenwe nakho kuqhutshwa kuphela kumagundane futhi kwaphumelela ezimweni ezimbili kwezintathu.
Ubulili bomntwana, mhlawumbe, buxhomeke emvamisa yocansi. Uma lo mbhangqwana ungashiyi komunye nomunye, cishe cishe kuyoba nomfana. Uma kwakukhona ikhefu elaneleyo kwezocansi noma ubuhlobo abukho ngokwanele, cishe cishe kuyoba khona intombazane.
Enye indlela yokwenza ucansi ixhomeke egazini labazali. Ukuvuselelwa kwegazi kwenzeka emadodeni njalo eminyakeni emithathu, futhi kwabesifazane - kanye njalo eminyakeni emine. Ubani igazi elisha, ukuthi ubulili buzoba yingane. Kubalulekile ukubala kusukela ngosuku lokuzalwa kwabazali besikhathi esizayo. Kodwa lapha kudingeka ucabange konke ukulahleka kwegazi, kuhlanganise nokulahlekelwa kwegazi ngesikhathi sokuya esikhathini nokuhlinzwa. Nakuba le ndlela inokwethenjelwa, kodwa kulula kakhulu ukwenza iphutha.
Futhi ubulili bomntwana bungancika eneminyaka yobudala bomama. Omama abasha ngokuvamile bazalwa abafana (cishe 55%). Owesifazane oneminyaka engama-30 kungenzeka ukuthi uzobeletha intombazane (53%). Amantombazane ahlala njalo futhi umzimba obuthakathaka wesimo semama uyithumela kaningi.
Amathuba amakhulu kakhulu okuzalwa komfana ngesikhathi sokuzalwa kokuqala. Ngokulandelana ngalokhu lokhu kunciphisa ngo-1%. Uma ubaba emdala kunomama, cishe kungenzeka ukuthi ukuzalwa komfana, futhi, ngokuphambene, obaba abancane bavame ukuba namantombazane.
Manje cabanga izindlela zokunquma ubulili bomntwana emva kokukhulelwe. Okokuqala, kuwukucwaninga kwezokwelapha. Ngesikhathi sokukhulelwa, noma yimuphi owesifazane une ultrasound (ultrasound). Yonke inqubo ithatha imizuzu engu-5-10, udokotela unquma igama, isikhundla se-fetus ne-placenta, ukuthi ingane iqala kanjani ngokujwayelekile. Ukunquma ukuthi ubulili bungaba semasontweni angu-14-16, ngaphandle uma ingane ifihla.
Ukuxilongwa kwangaphambi kokubeletha kunganikeza ulwazi oluthembekile ngensimu yengane. Le ndlela ihlanganisa ukungena emgodini we-uterine, uphenyo lwe-amniotic fluid, isifundo se-chorion kanye nokuqoqwa kwegazi lomthambo we-umbilical. Into yokucwaninga iqoqo le-chromosome yengane. Lena yinkambiso ebalulekile, ibeka ingozi enganeni, ngakho-ke yenziwa kuphela ngokusho komuthi kadokotela.
Kukhona nezindlela ezingezona zokwelapha ukunquma ubulili bomntwana. Isibonelo, uma umama enesibindi esinamandla endaweni yengane esandleni sakhe sokunene, khona-ke umfana uzozalwa uma intombazane ingakwesobunxele.
Ungabona futhi ukuziphatha komuntu okhulelwe. Uma izinyanga ezintathu zokuqala zidlula ngaphandle kwezinkinga, kwakungekho izinkinga ngesifiso sokudla, futhi ngaso sonke isikhathi wayibonisa isisu sakhe, eqhosha ngokuthi uzoba umama ngokushesha, wathi kuzoba nomfana. Uma ukukhulelwa kuqala kabi, umama akayidli kahle, futhi uyamahloni ngesisu sakhe, ukhathazekile ngenxa yokulahlekelwa ubuhle, khona-ke kuyoba khona intombazane.
Bathi futhi intombazane ithatha ubuhle babamama, kanti nabafana, ngokuphambene nalokho, abesifazane baba ngcono kakhulu nsuku zonke. Obaba bathi amadoda angama-bald angase abe nabafana.
Ngaphambilini, ubulili bomntwana bekunqunywa ukuma kwesisu. Uma isisu sikhulu futhi sibukhali, kusho ukuthi babelindele umfana, Futhi uma kuyisicaba, khona-ke intombazane. Nakuba le ndlela ayiqinisekiswa odokotela banamuhla. Bathi ukuma kwesisu akuxhomekile kobulili bomntwana, kodwa ngesakhiwo sekhanda lomama. Uma amathambo e-pelvic alula, khona-ke isisu sizoba sikhulu futhi sibukhali.