Thirty-four-year-old Maria Jones-Elliott hails the twins Amy and Katie as "little miracles".
Maria went into labour four months early, giving birth to Amy - but Katie did not arrive until three months later.
Their incredible births will now become a Guinness World Record for the "longest interval between the birth of twins". The previous record is 84 days, 'The Mirror' reported.
Doctors told Maria and husband Chris they have achieved the medical equivalent of winning the lottery, with both girls surviving and healthy.
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After a gruelling two days of labour at Waterford Regional Hospital in Ireland, Amy was born at exactly 24 weeks - almost four months before her due date.
After the birth, every day Maria was on a knife edge waiting for the second twin to arrive safely.
Finally, Maria was induced on August 27 at 36 weeks and three days, after doctors decided it was safe for her to give birth to Katie.
The existing record is held by Peggy Lynn of Pennsylvania, US, with a gap of 84 days between births, the report said.