The woman has a double uterus, so her pregnancy could have been complicated. This was reported by The Guardian, according to UNN.
Details
The American woman gave birth to her first girl, Roxy Layla, on December 19, and her second daughter, Rebel Laken, the next day. The births were delivered at the University of Alabama Hospital in Birmingham.
The children developed separately in each womb. Hatcher was first diagnosed with uterine didelphysis at the age of 17. It is is a rare uterine anomaly that occurs in only 0.3% of women.
I think it's fitting that they would have two birthdays. They both had their own "homes". And now they both have their own unique birth stories
Hatcher went into labor at 39 weeks. She gave birth to her first girl vaginally, and her second through via cesarean section. This was Hatcher's fourth pregnancy. She had previously given birth children from only one uterus.
A few weeks after Casey found out she was pregnant, she noticed bleeding and made an appointment for an for an ultrasound, as women with double uteruses have a higher rate of of miscarriages is higher.
During the visit, the doctors discovered that an additional fetus was forming in Hatcher's left uterus.
Of course, there was another child. We just couldn't believe it
Kelsey admitted that her husband Caleb didn't believe she was pregnant with twins at first, given her her particular personality.