An unborn baby incredibly managed to save her twin sister from inside the womb by sending out a distress signal.
Leah McBride, 28, from Texas, was expecting identical twins and was forced to deliver early after one of her baby's hearts began to waver - and it turned out this delivery at 31 weeks was vital.
Watch the sisters living life as adorable best pals here:
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Leah's pregnancy initially seemed to be going smoothly, but she found out at 21 weeks that their girls had twin-to-twin transfusion - where there is an imbalance of blood flow that causes one baby to become a donor and the other a recipient of all nutrients.
But after 31 weeks and five days, Poppy McBride forced doctors to deliver her and twin, Winnie, when her heart rate began to waver.
But despite being the smaller of the twins at 1lb 11oz, Poppy was perfectly healthy, and nothing was wrong with her heart.
It was her sister, Winnie - born weighing 3lbs 8oz - who doctors hadn't been concerned about during the pregnancy who was born with underdeveloped lungs and whisked to the intensive care unit.
Leah was subsequently told by doctors that Poppy saved her sister's life and if they had waited any longer to deliver the twins, Winnie would not have made it.
Three years on, Poppy is still looking out for her sister.
"Our doctors told us: 'I think your tiny twin saved her sister's life,'" Leah said.
"Poppy's heart rate had been all over the place, so they had to deliver but when she was born, she completely fine.
"They think she was sending out distress signals because she knew her sister wouldn't survive if they weren’t delivered then.
"Even now Poppy takes care of Winnie. Poppy is still much smaller.
"I love having a big and little. They are so close – it's sweet."
Winnie and Poppy were delivered on 24 May 2019 weighing 3lbs 8oz and 1lbs 11oz, after Leah was previously advised to terminate Poppy to give Winnie a better chance of survival.
Thankfully, an operation during the pregnancy to address the blood imbalance had been successful.
"Poppy just needed a little bit of oxygen, but she was OK," stay-at-home mum Leah said.
"She was smaller than a little Elf on the Shelf. Doctors said she was feisty.
"But Winnie, the bigger of the two, who I had never been concerned about, was very unhealthy. Her lungs were underdeveloped. They weren't sure if she was going to make it."
Miraculously, Winnie pulled through after having brain surgery at 14 days old, due to a build-up of fluid on the brain.
"A reservoir was placed with the intention to place a shunt as soon as she grew a little more but despite there only being a 10 percent chance of it resolving on its own it did," Leah said.
Poppy also had to have blood transfusions and stayed in hospital for 54 days - two days longer than her sister - to make sure she reached 4lbs.
Fast-forward to the present day, and they're both doing brilliantly.
"They are as smart as can be," Leah said. "Winnie is smarter than average. She can read books from memory at three.
"I tried to move their beds apart recently and they weren't having it. They are both amazing."
Jake Massey