Umyinge wexesha lokukhulelwa lunemihla engama-280. Ngaloo mihla kwisibeleko somfazi kukho ummangaliso wokwenene-uphuhliso lombindi womntu.
Amanyathelo okuphuhliswa kombungu
Iiveki 1-4. Inkqubo yokuphuhliswa kombungu iqala ngokukhawuleza emva kokuchumisa kweqanda - ngokukhawuleza iqala ukwahlukana kwamaseli. Sekudlulileyo kweli xesha, umntwana ozayo uza kufakwa zonke izitho ezibalulekileyo, kwaye ekupheleni kweveki yesine kuyo iqala ukujikeleza igazi. Ubukhulu bombindi abukho ngaphezu kwengqolowa yesanti.
Iiveki ezi-5-8. Ingqumbo kwiiveki ezi-5 sele isidli kwiqanda lomntwana, kodwa lisuka emzimbeni womama, ekubeni linomkhonto oqhubekileyo kwaye lufakwe eludongeni lwesisu. Kule nqanaba, izigaba eziphambili zokuphuhliswa kombungu zenzeke, izakhiwo ezibaluleke kakhulu zangaphandle zakha ngokuzimeleyo-intloko, iingalo nemilenze, iziseko zamehlo, iingcambu zempumlo kunye nomlomo. Usana luqala ukuhamba.
9-12 iiveki. Ngeli xesha, uphuhliso lwe-embryonic le-embryo luphela. Ngaphezu koko, imbungu iya kuba negama elingu-obstetrical "fetus". Ingqumbo yomntu isele iqokelelwe ngeeveki ezili-12, zonke iinkqubo zayo zilungele ngokupheleleyo kwaye ziya kuqhubeka ziphuhlisa.
13-24 kwiiveki. Ukuqulunqwa kwembungu ngexesha le-trimester yesibili kubandakanya ukutshintsha oku: i-cartilage ye-skeleton iyaba ngamathambo, iinwele zivela kwesikhumba sekhanda kunye nobuso, iindlebe zithatha indawo yazo efanelekileyo, izikhonkwane zenziwe, iiprooves kwizithende neentendelezo (isiseko seemifanekiso ezizayo). Umntwana uva izandi ngeveki le-18, ngeveki le-19 ukuqala kwamathambo angaphantsi kwamanzi. I-embryo inesifo sobuthathaka kwiiveki ezingama-20. Ngeveki yama-24, ukusetyenziswa komntwana ongakazalwa kungaqaliswa - umqhubi osebenzayo uqala ukuveliswa kwimiphunga, engavumeli ukuba iifila zecillary zivale ngexesha lokuphefumula.
25-36 iveki. Ngolwimi lwentsana, kuveliswa amaqabunga, zonke izitho ziyaqhubeka zikhula, ingqondo ikhula ngokukhawuleza kwaye ikhule. Ngowokuqala kwiveki yama-28, umntwana uvula amehlo akhe. Uphuhliso olusebenzayo lwamafutha angaphantsi, okwenziwa ngeveki ye-36 yi-8% yesilinganisi esisonke.
37-40 iiveki. Umntwana uthatha isikhundla apho uza kuzalwa khona. Ukususela ngoku, ulungele ubomi kwindawo yangaphandle.
Ubukhulu bombindi ngeveki:
- Iiveki ezili-12 - ukukhula komntwana malunga no-61 mm, ubukhulu bayo - 14 g;
- Iiveki ezingama-16 - 12 cm, 130 g;
- Iiveki ezingama-20 - 16 cm, 320 g;
- Iiveki ezingama-24 - 21 cm, 630 g;
- Iiveki ezingama-28 - 35 cm, 1 kg;
- Iiveki ezingama-32 - 40-41 cm, 1600 g;
- 37-40 iiveki - 45 cm, 2500 g;
Umntwana wexesha elipheleleyo uzalwa ngokuqhelekileyo ngokunyuka kwama-51 cm kunye nobukhulu - 3400 g.