Akatswiri ofufuza a ku America anatsimikizira kuti ana omwe anabadwa msinkhu, nthawi zambiri, amakhala opanda ana

Izi zatsimikiziridwa ndi asayansi a ku America amene adawona zotsatira za anthu mamiliyoni 1.2 omwe anabadwira ku Norway kuyambira 1967 mpaka 1988. Malinga ndi ofufuza a Medical Center ku University of Duke, ana pafupifupi 60,000 obadwa nthawi imeneyi anabadwa msinkhu. Pambuyo pake anyamata, omwe anabadwa kwa masabata 28-32. anali kukhala abambo osachepera 30% mobwerezabwereza kuposa omwe anabadwira nthawi. Pa kubadwa kwa nthawi yaying'ono kwambiri ya mimba, chiopsezo chosabala mwana chinawonjezeka, Geeta Swami, mtsogoleri wophunzira, adakumbukira. Anyamata omwe anabadwa pa masabata 22-27. kutenga mimba, anapeza ana awo ochepera ndi 76 peresenti kusiyana ndi omwe anabadwa m'masabata 37 mpaka 40. Ndipo atsikana omwe anabadwira pa tsikuli sanalandire ana 67 peresenti kuposa omwe anabadwira nthawi.