A particularly large 'baby' has gone viral on TikTok — but now some commenters are writing cruel comments, saying they're 'repulsed' by the little boy.

The 'baby' is actually a three-year-old named Gavin. And while is quite big for his age at 43" tall, Gavin also has a particularly young-looking face, thanks in part to a mostly hairless head.

So when his mother Kat started posting videos of him on TikTok, they quickly earned attention from viewers who couldn't get over what a 'big baby' Gavin is.

Big guy: A particularly large 'baby' has gone viral on TikTok — but now some commenters are writing cruel comments, saying they're 'repulsed' by the little boy

Happy kid: The 'baby' is actually a three-year-old named Gavin, who went viral with this video of him riding his dad's back

Toddler fun: While is quite big for his age at 43" tall, Gavin also has a particularly young-looking face, thanks in part to a mostly hairless head

Kat, who lives in the Midwestern US, told BuzzFeed that her youngest has always been big.

'We go for a regular doctor's check-up. There's a growth curve — he's off the charts! He's been off the charts since after birth,' she said.

During the pandemic, Kat's 16-year-old son Caleb introduced her to TikTok, and she immediately though about posting videos of Gavin on the app.

'I woke up on Sunday and I said to my husband "I'm going to make him famous" and it happened,' she said.

The videos of Gavin quickly took off, getting hundreds of thousands of views apiece.

Viral: When his mother Kat started posting videos of him on TikTok, they quickly earned attention from viewers who couldn't get over what a 'big baby' Gavin is.

Growing boy! Kat, who lives in the Midwestern US, told BuzzFeed that her youngest has always been big

Famous: Kat's 16-year-old son Caleb introduced her to TikTok, and she immediately though about posting videos of Gavin on the app

'I woke up on Sunday and I said to my husband "I'm going to make him famous" and it happened,' she said

One video, in particular, has been viewed 10.7 million times on her page alone. In it, Gavin is wearing white underwear and sitting on his dad's back, as his dad lays in bed.

Gavin dances and jumps on his dad, giggling and smiling.

Many of the comments are sweet, calling Gavin 'adorable' or 'cute' — but Kat has been shocked by the negative responses.

On woman shared the video on Twitter, writing, 'Is anyone else just absolutely REPULSED by this giant baby' — a tweet that's earned over 325,000 likes.

Others replied with their own cruel jokes and judgement.

'Put it back in the lab please,' wrote one, while another commented, 'I’m still so off put by this I’ve watched it so many times I hate this little beast.'

Cruel: Several commenters have written cruel things about him on Twitter, but Kat said they have 'thick skin'

Mean! Others have come to the child's defense and shamed those who are 'making fun of a baby'

The nasty comments have grown so numerous that others have chimed in to share their disgust with the negativity.

'Y'all really out here body shaming mf babies. No one is safe,' wrote one.

'Making fun of a baby... twitter sickens me,' said another.

Kat has seen the mean remarks, saying, 'Some are mean, even a bit harsh about it. He is what he is.'

Though they upset her at first, she said, 'we have thick skin, it's not big deal to us.'

People can be mean online, they're behind a mask,' she added.

Ultimately, she thinks her videos have made a lot of people happy, and that's what she chooses to focus on.

'I think he's brought a lot of joy to people,' she said. 'I wish I had a mom-cam on myself because I can't capture all the stuff he does.'