A woman with a rare double uterus gave birth twice in 48 hours, following a “one in a million” pregnancy and 20 hours in labour.

Kelsey Hatcher, 32, delivered one daughter on Tuesday, and a second the day after, at the Unversity of Alabama at Birmingham Hospital, reports the BBC.

Announcing the arrival of her “miracle babies” on Instagram, Ms Hatcher hailed the “incredible” medics who cared for her.

The girls are fraternal twins – with rare separate birthdays.

Kelsey said the family was now back at home and could “enjoy the holidays”, having previously expected a Christmas due date.

“Never in our wildest dreams could we have planned a pregnancy and birth like this … but bringing our two healthy baby girls into this world safely was always the goal, and UAB helped us accomplish that,” Hatcher said in the hospital’s press release.

The mum was told at age 17 she had a double uterus (uterus didelphys) – which the UAB described as a rare congenital anomaly affecting 0.3% of women.

And the odds of becoming pregnant in both uteri – a dicavitary pregnancy – were even slimmer, at “one in a million”, according to the UAB.

Reported cases worldwide are extremely rare. In 2019, a doctor in Bangladesh told the BBC a woman had given birth to twins almost a month after delivering a premature baby in her other uterus.

The latest delivery is Kelsey’s fourth pregnancy. She has previously delivered babies from one uterus at a time only.