Iiveki ezilishumi elinambini zokukhulelwa ngumhla obalulekileyo wowesifazane, njengoko oku kukuphela kwekota yokuqala. Ngeli xesha, i-placenta ikhiqiza i-progesterone eyaneleyo, kwaye ngokupheliswa komsebenzi we-hormonal, umzimba ophuzi uyancipha kancane kancane. Ngeli xesha, i-trimester yokuqala ihlolwe (ukusuka kwiiveki ezili-11 ukuya kuma-13 kunye neentsuku ezingama-6), ukuchonga iqela elijongene nobungozi ngokungaqhelekanga kwe-chromosomal, kunye ne- ultrasound yokuqala ekukhulelweni . I-ultrasound kwiiveki eziyi-12 zokunyuka, ukuphuhliswa komntwana kufaka ngqo ngokuchanekileyo, ngokukodwa ukubonakalisa.
Imilinganiselo ebalulekileyo, enomnye wexabiso eliphambili, yi-CTE yomntwana kwisithuba seveki ezili-12. Esi sibonakaliso sisetyenziselwa ukuchonga ubukhulu bomntwana kunye nokubala ixesha lokukhulelwa ngokubambisana nesisindo esilinganiselweyo. Ubungakanani bee-12cm ze-coccy-parietal malunga ne-5.3 cm. Ukuba ukuphuhliswa kwembungu kwiintsuku ezidlulileyo ngaphandle kweengxaki, kwaye zikhula nge-1 mm ngosuku, i-embroyo yomntu yeeveki ezili-12 ikhawuleza izinga lokukhula ukuya kwi-1.5-2 mm ngosuku. Oogqirha bancomela ukulinganisa i-CTE yomntwana kwisithuba se-11 okanye kwiiveki ezili-12.
Kufuneka ukhunjulwe ukuba ubungakanani be-coccygeal-parietal size buxhomekeke kubude bokukhulelwa ukuya kwimihla, ngoko ke impazamo eqhelekileyo yimihla emithathu ukuya kwezine. Iqhelekileyo ithetha i-CTE ye-embryo ngu-51 mm. Ngokuphambukiswa okuncinci, ungakhathazeki - ukunyuka okuqhelekileyo ukusuka kwi-42 ukuya kwi-59 mm kunokwenzeka.
Ukuthelekisa, sibonisa i-CTE yomntwana kwisithuba seveki ezili-11: ixabiso eliqhelekileyo li-42 mm, ukuphambukiswa okuvumelekileyo kwimiqathango ye-34-50 mm. Xa uthelekisa ezi zikhombisi, unokubona ukuba kubaluleke kangakanani imihla ngemihla nge-ultrasound.
Imbryo 12 iiveki
Oomama bokamva ngokuqinisekileyo ukuba kukhangeleka njani nokuba isiqhamo singenza ntoni kwiiveki ezili-12. Ngexesha le-ultrasound, umama unokubona indlela umntwana wakhe athatha ngayo umunwe wakhe, kwaye uvale i-110-160 beats ngomzuzu ubetha intliziyo encinci. Intsana ihamba ngokutshintsha kwaye iphendukele kwi-fetal bladder, isifuba sehla kwaye ikhuphuka ngexesha lokuphefumula. Kwakhona, isiqhamo sele sinekhono lokuqhaqhaza, vula umlomo wakho uze uguqulwe iminwe yakho.
Ngokubhekiselele kwizibonakaliso zophuhliso, kuyafaneleka ukuphawula ukuvuthwa kwe-thymus gland, enoxanduva lokuvelisa i-lymphocytes ngumzimba kunye nokuphuhliswa kokuzikhusela. I-pituitary gland iqala ukuvelisa i-hormone echaphazela ukukhula komntwana, umzimba we-metabolism nomsebenzi wokuzala womzimba. Isibindi sembungu siqala ukuvelisa i-bile, esiza kunceda ekutyeni ukutya. Inkqubo yokutya ikulungele ukugaya i-glucose.
Umbungu ulinganisa malunga ne-9-13 amagremu kwiiveki ezili-12, isiqhamo solule kwaye sisesikhundleni sokuhlala. Ubungakanani ukusuka kwisithsaba kuya kwi-sacrum bu malunga ne-70-90 mm. Intliziyo yesibindi ngeli xesha linamagumbi amane: ii-atria ezimbini kunye nama-ventricle amabini, kwaye ukuphindaphindwa kwee-contractions kuyahluka ukusuka kwi-150 kuya kwe-160 ukubetha ngomzuzu. Isithambo esibhakabhakeni siqala ukwenza, amaqabunga amazinyo obisi, kunye ne-larynx, iimbambo zezwi.
Eli xesha lokuphuhliswa kwamakhwenkwe lubaluleke kakhulu. Ngenkqubo yokwenza umsebenzi we-testosterone, eveliswa yizintlu zesini zamakhwenkwe, izitho zangasese zangaphandle ziqala ukwakha - ipeni kunye ne-scrotum. Xa kwenzeka ukuphulwa kwalo msebenzi, i-hermaphroditism ingabonwa.
Umama uziva njani kwiiveki ezili-12 zokukhulelwa?
Kwixesha eliqhelekileyo lokukhulelwa kunye nophuhliso lomntwana, owesifazane okhulelweyo kufuneka athole kwi-1.8 ukuya kwi-3.6 kg. Izinga lokufumana ubunzima liphakathi kwama-300 no-400 amagremu ngeveki. Xa uthayipha ubunzima ngaphezu kokuqhelekileyo, kufuneka unciphise inani le-carbohydrate elula (iifom, ii-cookies, i-halva, njl.).
Abasetyhini abaninzi banenkxalabo malunga nokubukeka kwaloo mhla wemibala enemibala ebusweni, entanyeni, esifubeni, nakubonakala umgca omnyama ovela kwintonga ukuya kwi-pubis. Nangona kunjalo, akufanele ukhathazeke, ezi zibonakaliso eziqhelekileyo, kwaye ziya kuphinda zizalwe ngokutsha.
Umbungu kwiiveki ezili-12 uphumelele ngempumelelo indlela yobomi kwaye emva kweveki ezili-12 ubizwa ngokuba ngumntwana. Kwinqaku lethu, umama ozayo uza kufumana ulwazi oluncedo kuye ngokwakhe, ukuze aqonde kangcono malunga nosana lwakhe oluzayo.