‘How many years was he in there?’

She broke the internet — and a hospital record.

New mom Shelby Martin has gone viral after giving birth to the biggest baby to be born at Nashville’s TriStar Centennial Women’s Hospital in more than three years.

The Tennessean has shared several photos and videos of her adorable newborn boy, named Cassian, who weighed in at a whopping 12 pounds, 14 ounces (5.8 kg).

“When people talk about having a big baby, like I don’t know ball. But trust me… I know ball,” Martin quipped in a TikTok post that gained more than 4.4 million likes on Oct. 1.

The post shows Martin before birth, standing in her hospital gown and showing off her oversized bump. It subsequently shows baby Cassian, moments after birth, who stunned doctors and nurses with his sheer size.

The TikTok has racked up more than 50,000 comments from stunned and amused viewers.

One viewer summed up the disbelief perfectly: “HOW MANY YEARS WAS HE IN THERE?”

Another wondered if the delivery involved some creative engineering, writing: “Did the baby have to come out of the sunroof????”

“Did you have to push or did he walk out?” another joked.

Meanwhile, TriStar Centennial Women’s Hospital called the delivery “a beautiful reminder of resilience and love.”

Cassian had a brief stay in the NICU, where he received an IV and oxygen, and his glucose levels were monitored.

Martin chimed in with thanks to the team: “I also want to send extra thanks to the ladies that took the best care of me and helped me navigate through C-section recovery as a first-time C-section mama. Another huge thank you to the NICU team that cared for our big guy and loved on him when I couldn’t. I will never forget you.”

And if you thought it couldn’t get sweeter, Cassian arrived on Shelby’s own birthday, her “greatest gift” yet.

From viral TikTok fame to newborn superstardom, Cassian proves you can’t underestimate a big baby — or a mom with a sense of humor.

And Cassian isn’t the first jumbo baby to grab the internet’s attention.

Last month, in Florida, Daniella Hines nearly had a heart attack — and a hernia — when she delivered her son Annan at St. Joseph’s Hospital-South in Riverview on September 3.

The C-section revealed a whopping 13 pounds, 15 ounces of newborn muscle.

Over in Alabama, another record-breaker arrived in March.

Pamela Mann, a delivery driver near Birmingham, welcomed daughter Paris Halo, a 13-pound, 4-ounce little lady, during a scheduled C-section at Alabama Grand View Medical Center.

Mann had braced for a normal baby, but Paris was anything but ordinary.

For comparison, Stanford Children’s Health says the average newborn tips the scales at just 7 pounds — meaning these babies weren’t just big, they were colossal.

Ultimately, in the battle of baby bumps, these tots didn’t just win — they broke the scale.