O.H.
I have not heard of that but just wanted to mention my daughter was born with a heart condition. It would go from a normal rate up to 280 and back again, like her heart was confused. Common in older folks, not so much newborns. I didn't see her until she was 2 days old. It was VERY scary. Ends up they put her on adult meds for 6 months and it worked and hasn't had a problem since. She's 15 now.
So just go get it looked at. Good thing the doc caught it and you can address it. I hope everything works out. Good luck.