Adiah and Adrial Nadarajah were born at 126 days early, overtaking the previous record of 125 days early set in 2018 by twins in the US state of Iowa.
If the children had been born even one hour earlier than 22 weeks, life-saving measures would not have been attempted by the hospital, Guinness says.
A full-term pregnancy is usually 40 weeks, making them 18 weeks premature.
Mum Shakina Rajendram said that when she began labour at just 21 weeks and five days, doctors told her that the babies “were not viable” and had “0% chance of survival”.
Despite heavy bleeding, she said she tried her best to “hold the babies in” for a few more hours.
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Her water eventually broke 15 minutes after midnight. Less than two hours after entering 22 weeks in the womb, the children were born.
Adiah and Adrial have now lived to be one year old, despite serious medical issues early on.
“We watched the babies almost die before our eyes many times,” Mrs Rajendram said. While they are still being closely followed by doctors, the siblings are “doing great”.
