Update 23 June 2021: The Gauteng Provincial government has since released a statement saying medical tests show that Gosiame Sithole had not given birth recently, and nor had she been pregnant.
A South African woman has reportedly given birth to 10 babies in what would be a new world record.
Gosiame Thamara Sithole's husband says they were astonished by decuplets after scans only showed eight in the womb.
"It's seven boys and three girls. I am happy. I am emotional. I can't talk much," her husband Teboho Tsotetsi told Pretoria News after the birth.
One South African official confirmed the births to the BBC, however another said they were yet to see the babies.
A family member, who did not want to be identified, told the BBC that Ms Sithole had had 10 babies - five via natural birth and 5 via caesarean section.
Guinness World Records told the BBC it was investigating Ms Sithole's case.
A woman who had eight babies in the US in 2009 currently holds the Guinness World Record for the most children delivered at a single birth to survive.
Last month, 25-year-old Halima Cissé from Mali gave birth to nine babies, who are reportedly doing well at a clinic in Morocco.
Most pregnancies involving large numbers of babies end prematurely, says BBC Africa's health reporter Rhoda Odhiambo.
Multiple births involving more than three babies are rare and often the result of fertility treatments - but in this case the couple say they conceived naturally.
Prayers and sleepless nights
Ms Sithole, 37, previously gave birth to twins, who are now six years old.
She is said to be in good health after delivering 29 weeks into her pregnancy in Pretoria on Monday evening.
Speaking to Pretoria News a month ago, Ms Sithole said her pregnancy was "tough at the beginning" and she had prayed for a healthy birth, with many a sleepless night worrying about what was to come.
"How would they fit in the womb? Would they survive?" she asked herself, but was reassured by doctors that her womb was expanding.
When it was thought she was carrying eight foetuses, Ms Sithole was suffering leg pains and doctors found that two of the eight "were in the wrong tube".
"That was sorted and I have been okay since then. I can't wait for my children," she told the newspaper at the time.
Her husband also said he was over the moon, and felt like "one of God's chosen children. It's a miracle which I appreciate".