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A pair of conjoined twins were born at the Dr Malizo Mpehle district hospital in Tsolo, in Mthatha on Wednesday.
Eastern Cape health department spokesperson Sizwe Kupelo says the girls have a combined weight of four kilograms.
They share an umbilical cord.
Doctors at the Nelson Mandela Academic hospital are now assessing to see if they are not sharing vital organs.
They have a joined upper abdomen and chest.
This is the fifth set of conjoined twins born in the Transkei in the past two years.