Iviki lamashumi amabili nesikhombisa lokukhulelwa yisikhathi sokuguquka phakathi kwezinyanga ezintathu nesithathu zokukhulelwa. Ngalesi sikhathi zonke izitho nezinhlelo zengane sezivele zisebenza ngokusebenzayo futhi ziqhubeka zikhula kuze kube yizinyanga ezingu-9.
Okwamanje, ingane isivele inyanga yayo yesikhombisa yentuthuko futhi iyasebenza ngokuphelele. Izingibe ezisemqoka zalesi sikhathi zihamba kahle (ingane ayisakwazi ukugcina ukushisa komzimba uma kwenzeka kuzalwa ngalesi sikhathi). Emaphashini, kuphela ukuhlanganiswa komuntu osebenza nge-surfactant (into ehlanganisa amaphaphu avela ngaphakathi futhi awasakaze) uqala - okungukuthi, amaphaphu wengane aphefumula ngokuphefumula, okugcwele ukuma kwawo ngaphandle kwemishini yokwelapha efanele.
Emasontweni angama-27, umbungu, osuvele ubizwa ngokuthi i-fetus ngalesi sikhathi, uhamba ngokufudumele, ngisho nokuphefumula, naphezu kokuthi amaphaphu ayo agcwele amniotic fluid futhi angahlanganyeli ekushintsheni kwegesi. Lokhu kuyadingeka ekuthuthukiseni umuthi wokuphefumula wengane. I-fetus isivele ivule amehlo, ikhanya ngokuzenzekelayo, yenza izinyathelo zokuncelisa ngezindebe, ngezinye izikhathi ngisho impela ifaka umunwe.
Ekuqaleni kwe- trimestre yesithathu, abesifazane abakhulelwe baqala ukuthola isisindo, kodwa lokhu kuyisibonakaliso se-course efanele yokukhulelwa. Phakathi nalesi sikhathi, izinto ezidingekayo ekuthuthukiseni ingane ezinyangeni ezimbili ezilandelayo nasesikhathini sokuhamba kwesikhathi zigcinwe. Ngokuvamile isisindo esitholakalayo ngesikhathi sokukhulelwa masinyamalala ngemva kokuzalwa.
Isonto lama-27 lokukhulelwa - isisindo somntwana
Emasontweni angama-27, isisindo se-fetus siseduze no-1-1.5 kg, ngokuya komthethosisekelo wabazali. Ngesikhathi esifanayo, le-fetus incane kakhulu futhi ihlukaniswe ubude, ngoba iningi lezingane ziyizinyanga ezingu-8 zokubeletha, i.s. phezu kwamasonto angu-13 alandelayo. Futhi, ingane ikhula ngobude ngobude - okwamanje ubude bayo buyi-30-35 cm, futhi ngesikhathi sokuzalwa kuyokhuphuka ibe ngu-50-55 cm.