The user, known as @shans1588, revealed that her son weighed a staggering 6.6kg at birth and was 60cm long.
To put that into perspective, the average boy weighs around 3.5kg at birth and, if they weigh 4.5kg or more, they’re considered on the large side.
Basically, this guy was almost double a typical weight.
Fellow TiktToker @tawnee asked fellow mothers to share their stories of having big babies when @shans1588 stole the show.
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In her response – which has since been viewed more than 30 million times – she says: “You wanna play the biggest baby? I got you.”
She explained: “At 38 weeks and one day, I had my second son via C-section.”
But her boy was so big she needed not one but two doctors in attendance.
"He came in at a whopping 14.6lb (6.6 kg)," she continued.
"Yes, I gave birth to a toddler, who then spent 11 days in the NICU (neonatal intensive care unit), where clearly he was the biggest baby in there.
"The NICU did not even have diapers for him or clothes, they had to go upstairs to pediatrics to get size three diapers and he came home in clothing – six to nine months."
Her story has been met with awe on social media, with the video garnering more than 7.4 million likes on TikTok alone.
Scores of users have joked that the baby basically came out as a fully-grown man, with one writing: “That baby drove himself home from the hospital.”
Another commented: “When you’re born on a Saturday but gotta play for the NFL on Sunday.”
“We need an update on him,” wrote another. “He’s probably in college or something already.”
“He already has a credit score of 800,” added another.
If we’re really going to play the “biggest baby game”, however, we’ve got to turn to the Guinness Book of World Records.
It states that the heaviest child ever born to a healthy mother was a boy weighing 10.2kg, in Aversa, Italy, in September 1955.
That’s not a toddler, that’s a fully-fledged child.