Bangaki abantu abanemibhangqwana efanayo futhi yini eyingqayizivele?
Abantu banamabhangqa angu-22 afanayo ngaphandle kwamabhangqa angu-23 angahluka. Umbhangqwana wama-23 ukhomba ubulili futhi akudingeki ukuba uhambisane. Umbhangqwana wama-21 yiwo ngezinye izikhathi onengxenye yesithathu ebangela i-Down syndrome.