A UK woman gave birth to a boy and girl just minutes apart, yet the siblings are not twins, according to a report in the Daily Mail.

Thomas and Harriet Mullineux were actually conceived three weeks apart.

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Their mother Charlotte Mullineux had been pregnant with twins when she miscarried one of them at seven weeks. But two weeks later she discovered she was carrying another fetus — conceived separately and still growing in her womb.

"I was disappointed I had lost one of them but was more concerned about the other one," the 28-year-old said. "Those two weeks were agony for us. When I went back I was astonished when they said there was another baby.

"It turned out the blob that was on my last scan picture had grown into a baby."

The surviving twin and the new baby were born last May and, after a health scare, are now home and doing well.