Few babies become famous in utero.

Enter sandman, aka the unborn child of Makelle and Jared Ahlin of Santaquin, Utah.

Makelle is 22 weeks pregnant. Last week she and her husband had a sonogram that left them comfortably numb.

Their baby flashed the “rock on” sign.

Welcome to the jungle, baby.

“Well it’s official our kids are the coolest even before they enter the world … or they are just really full of themselves,” Makelle, 27, wrote on her Facebook page, where she posted her sonogram photo of her third child.

Her husband, Jared, 30, was the one who noticed the hand gesture during the routine “here’s the head, here’s the heart” photo op on Thursday.

“Wait! Go back! Go back! I want to see that again,” he told the sonogram tech.

“My husband was so excited,” said Ahlin, a grade school reading specialist. “His excitement just made me start giggling. The ultrasound lady probably wanted to kill me because I could not stop laughing.”

When Ahlin posted the photo on her Facebook page and for her 19,000 followers on Instagram, people thought it was fake.

It’s Photoshopped, they said.

“No one believes us,” she laughed. “I can barely run Microsoft Word. I don’t know how to Photoshop.”

Their sonogram tech saw the couple featured on the local news and verified that she took the image. “Cutest couple and the baby was so fun to scan!” she wrote on her own Facebook page.

Ahlin says her baby apparently likes music. At 21 weeks she was listening to a Spotify station, and “the baby was going crazy, just started kicking.”

But it wasn’t rock ’n’ roll.

If that’s really a “rock on” sign — not Texas longhorns, like some people think — the baby is flashing it doesn’t match her or her husband’s taste in music.

Her outdoorsy husband, Jared, who works at a cement plant, likes country music except for that one brief love-in with Metallica. She listens to Mumford & Sons.

“We’re not much of a rocker family,” she laughed.

They know the baby’s sex, which they plan to reveal to the rest of the family on Friday.

Wild horses couldn’t drag the news out of them before then.

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