After a long-haul flight to Australia, Janet Manley, from New York, noticed her 2-year-old stepped off the plane speaking with a British inflection.

The 21-hour flight across the Pacific binge-watching UK children’s show “Peppa Pig” had resulted in a classic case of “monkey see, monkey do.”

“My kid had adopted Peppa Pig’s plum British accent, calling me ‘Mummy’ and finishing her sentences with Peppa’s trademark snort,” Manley wrote in Romper.

“Two years later, she still oinks in conversation. Call it the Peppa effect.”

And Manley certainly isn’t alone. Many American families have taken to social media to describe how the popular animated series is causing their kids to adopt British accents.

The show follows the adventures of Peppa, an adorable pig who lives with her family in a small town in the United Kingdom.

“That moment when you realize your child has a British accent from watching too much Peppa Pig,” one father wrote on Twitter.

“My 3 yr old [sic] cousin has an english accent from watching Peppa Pig and I’m jealous,” another woman wrote.

Even US film critic Clayton David admitted his son isn’t immune to Peppa’s English charm.

“Best thing that Noah does these days is speak in a British accent [because] of Peppa Pig,” he tweeted.

Kansas City mom Molly Smalley filmed a video of her 3-year-old son, Oliver, who picked up the Queen’s English “pretty quickly” after watching Peppa. It has had thousands of views online.

“We think it’s really funny! He will still do it,” she told ITV News.

The “Peppa effect” is real.