Iiveki ezingamashumi amabini anesibhozo sokukhulelwa yithuba lokutshintsha phakathi kweyesibini neyesithathu zokukhulelwa. Ngeli xesha zonke izitho kunye neenkqubo zentsana sele zisebenza ngokusebenzayo kwaye ziqhubeka zikhula zide zinyanga ezili-9.
Okwangoku, umntwana usele nyanga yesikhombisa yentuthuko kwaye uyasebenza ngokupheleleyo. Iingxobo eziphambili zeli xesha zizinzileyo (umntwana akakwazi ukugcina ubushushu bomzimba ngexesha lokuzalwa ngeli xesha). Emiphakeni, kuphela ukuhlanganiswa komntu osebenzayo (into efihla imiphunga esuka ngaphakathi kwaye isasazeka) iqala-oko kukuthi, imiphunga yomntwana iphelisa ngokuphefumula, echaphazelekayo ngokuyeka kwayo ngaphandle kwezixhobo zokusebenza ezifanelekileyo.
Kwiiveki ezingama-27, i-embryo, esele ibizwa ngokuba yi-fetus ngeli xesha, ihamba ngokunyanisekileyo, nokuba iphefumla, nangona imiphunga yayo igcwele i- amniotic fluid kwaye ingathathi inxaxheba kwi-gas exchange. Oku kuyimfuneko ekuphuhliseni imfucu yokuphefumula yomntwana. Umntwana sele sele evula amehlo, ekhanyela ngokukhawuleza, enza iintshukumo ezinomlomo ngomlomo, ngamanye amaxesha uyakuncoma ngomunwe.
Ekuqaleni kwekota yesithathu, abafazi abakhulelweyo baqala ukuthoma umzimba, kodwa lo luphawu lwekhosi efanelekileyo yokukhulelwa. Ngeli thuba, izinto eziyimfuneko ekuphuhlisweni kwengane kwiinyanga ezizayo ezi-2 kunye nexesha lokuhamba emva kokugcina. Ngokuqhelekileyo ubunzima obuthatywayo ngexesha lokukhulelwa bukhawuleza emva kokuzalwa.
Iveki yama-27 yokukhulelwa - isisindo somntwana
Kwiiveki ezingama-27, ubunzima bomntwana obusondeleyo buyi-1-1.5 kg, kuxhomekeke kumgaqo-siseko wabazali. Ngexesha elifanayo, umntwana usalomzimba kakhulu kwaye udeleleke ubude, ekubeni uninzi lwama fetus luyiinyanga ezili-8 ukuya ku-9, kwiiveki ezilandelayo ezi-13. Kwakhona, umntwana usakhula ngobude - ngelixa ubude balo bu-30-35 cm, kwaye ngexesha lokuzalwa liza kunyuka libe ngama-50-55 cm.