The video was still on YouTube despite numerous comments flagging up the harmful content, she said.
She added: "When we watched a video the "Momo" character told him to tell everyone to fear Momo or it will kill him in his sleep".
"It makes me angry and sad and frustrated", Hess told CNN.
The pediatrician found seven more unsettling videos on YouTube Kids on Friday alone.
"I think our kids are facing a whole new world with social media and internet access".
Parents have been frantically trying to find out more about the terrifying game, which has been linked to the death of a 12-year-old girl in Argentina.
Hess, a pediatrician, put out a call to action to different groups to report the video to get it removed from the site.
Hess, who wrote about the issue on her blog, said she saw a number of YouTube Kids videos "glorifying not only suicide but sexual exploitation and abuse, human trafficking, gun violence and domestic violence".
Hess said the doctored "Splatoon" videos are not the only ones pushing dark and potentially risky content on social media platforms, particularly on YouTube Kids.
Northcott Community Special School took to Twitter to make parents aware of the hack. One video that looked like a Minecraft video game had a school shooting. The video shows a character opening fire and cursing before the video cuts to a dead body.
"I believe this cartoon was up for about six months prior to it coming down", she told the station. I immediately turned off the video. "One suggested video was an hours-long lecture by Icke in which he claims that aliens built the pyramids, that the planet is run by reptile-human hybrids, that Freemasons engage in human sacrifice, that the assassination of President Kennedy was planned by the United States government, and that humans would evolve in 2012".
But recently, several parents have discovered disturbing videos on the site - ones making them question how safe a place it is.
The website for YouTube Kids promises "A safer online experience for kids".
I think it's extremely unsafe for our children.
YouTube made a statement that says they take the feedback seriously. We've also been investing in new controls for parents including the ability to hand pick videos and channels in the app.
If you or someone you know may be struggling with suicidal thoughts or showing warning signs of suicide, please consider calling the U.S. National Suicide Prevention Lifeline at 800-273-TALK (8255), texting the Crisis Text Line at 741741, or seeking help from a professional.
For confidential support in the United Kingdom call the Samaritans on 116123 or visit a local Samaritans branch, see www.samaritans.org for details.
Cohen is expected to come to the congressional hearing with documents and other visual aids to support his contentions. The news comes as Cohen is now in Washington , D.C. for three hearings before Congressional committees.
Iran's Foreign Minister has said he is stepping down, in a surprise announcement made on his Instagram account . Since then Mr Trump's administration has reimposed harsh economic sanctions that were lifted under the deal.
She assumes the role at a hard time, as Saudi Arabia tries to quell an worldwide outcry over journalist Jamal Khashoggi's death. This is reportedly the first time ever that a female has been appointed as the Ambassador of Saudi Arabia to the United States.
Oscars 2019 Complete Winners List: Green Book, Rami Malek, Olivia Colman, Black Panther Win Top Honours at 91st Academy Awards . And I could not be more grateful to each and every one of you, and everyone who believed in me for this moment.
Nominated in eight categories and the second most honoured film, it was only awarded one prize, for make-up and hair styling. She went on to thank her co-stars, family, punctuating her speech with the occasional hysterical sputter of amazement.
A Court of Inquiry has been ordered to investigate the cause of the fire, a Press Information Bureau (Defence Wing) release said. The IAF deployed rapid action forces and sent one helicopter to assist civil emergency services on the direction of the fire.
Johnson kickstarted his round with an eagle at the par-four second, where he hit his tee shot to four feet. He followed that with a three-putt bogey on the 16th, and a birdie on the final hole gave him a 70.
The activist group that arranged the visit used a different word to describe the exchange: "condescending ". Amazon withdrew from the NY deal on February 14 because of opposition from state and local politicians.
Sevilla outplayed Barcelona through much of the first half and led twice with goals from Jesus Navas and Gabriel Mercado (42nd). Luis Suarez was a major culprit in this regard, although Messi certainly wasn't at his usual best in front of goal.
Tellingly, Trump's statements on the situation came in the presence of Chinese Vice Premier Liu He, just before their talks. The Pulwama attack that took place on February 14, 2019, and has changed a lot of things between India and Pakistan.
1TB microSD Cards Are Coming to a Store Near You
Although Nintendo Switch owners who are exhausted of running out of space for games on their consoles might see some benefit. Honestly, I can see many passing on the SDcard due to the hefty price tag but my question is, is it worth the price?
New York Rangers: Adam McQuaid traded to Columbus
The 29-year-old had spent his entire career with the Devils, who signed him as an undrafted free agent in 2011. In exchange, the Blue Jackets are sending Anthony Duclair and 2 second-round draft picks up to the Senators.
Lady Gaga wins first Oscar
But don't go thinking that Gaga and Cooper's on-stage chemistry is going to lead the two into a romance. Gaga led Cooper to a piano by hand, where they sang facing one another and Gaga played the ivories.
Huawei claims to have the world's fastest foldable 5G phone
There's also a 4,500 mAh battery inside, which can be powered up to 85 per cent in 30 minutes thanks to the 55W supercharging. Huawei Mate X will arrive in the middle of 2019 for 2,299 (that's about $2,600) in only one color - Interstellar Blue.