Tony Stower, head of child safety online at the NSPCC told the BBC: "Tech giants have a responsibility to protect children on their platforms, but YouTube and YouTube Kids keep failing to tackle disturbing videos like this".
Hess, a pediatrician, put out a call to action to different groups to report the video to get it removed from the site.
One mother told the paper her daughter felt "sick and terrified" after watching the videos.
Hess stated that she's aware some of these videos were not initially intended for a younger audience, yet they have somehow ended up on the YouTube Kids app.
YouTube Kids has previously come under fire for failing to curate content on the platform correctly, Business Insider reported past year that conspiracy theory videos were prominent on the platform.
The mother also goes to compile videos of Minecraft videos with multiple shooting scenes including one within a school.
In both cases, the videos were eventually removed after they were reported to YouTube.
In her post, the mother wrote "t$3 his video was intentionally planted on YouTube Kids to harm our children".
YouTube told WFTX the video violates its community guidelines, and a spokesperson said in part, "We work hard to ensure YouTube is not used to encourage unsafe behavior, and we have strict policies that prohibit videos which promote self-harm". "Every quarter, we remove millions of videos and channels that violate our policies and we remove the majority of these videos before they have any views". That way they can report inappropriate content to social media platforms, so it can be pulled.
Children's charity the NSPCC has accused YouTube of failing to tackle unsafe content on its youth channel. Still, she said, it's not enough.
After the first case of the "Momo challenge" was discovered in the United Kingdom, the boy's parent, who wished to remain anonymous, said she was "deeply alarmed" when her seven-year-old son's teacher told her he'd made threats to other children in school. "There needs to be messaging - this is why it's not OK", Kaslow said.
"But no system is ideal and inappropriate videos can slip through, so we're constantly working to improve our safeguards and offer more features to help parents create the right experience for their families", the website's description says.
She added that there should be "serious consequences" for those who had a hand in the videos, noting that it was "very worrisome" that they were targeting children.
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.