YouTube star Ms Rachel has sparked furious backlash online as hordes of parents accused her of making them feel bad about their kids' development.
The former preschool teacher, whose real name is Rachel Anne Accurso, 43, has become a massive online sensation thanks to her wildly successful YouTube series that is focused on teaching babies how to talk.
But when she shared a video showing off one-year-old daughter Susie's impressive vocabulary, it left some viewers wondering if their own children were behind.
The clip, which was shared to TikTok last week, showed Ms Rachel sitting with her daughter in her lap.
She asked the youngster to say things like 'hi,' 'bye,' 'mama' and 'dada' to the camera, all of which Susie said easily.
The baby also said the words 'nana,' 'papa,' 'pop,' 'aw,' 'uh oh' and 'yay' as well as 'baba,' which Ms Rachel explained was her nickname for her brother.
And while the mother-of-two was extremely proud of her daughter, not all viewers were as impressed.
In fact, many moms and dads admitted in the comment section that it was extremely upsetting to see how advanced Ms Rachel's daughter was in comparison to their own kids.
'Well this made me feel like st,' one mom wrote.
'I talk and sing to my 13-month-old every day but they can't say any words. This is so cute but it's hard not to feel sad and compare,' another penned.
'Other moms are literally questioning their parenting 'cause their 15-month-old says mama and dada and that’s it,' read one comment.
A fourth said: 'Here I am begging just to get one word at 20 months old. In speech therapy. It’s a slow process. I feel like I failed him somehow.'
Others, however, reminded parents that every child develops differently.
'For every parent watching and feeling like your kid is behind at 12 months - THEY ARE NOT,' urged one user.
'This is more words than a typical 12-month-old has. At 12 months if they have even ONE word that is average.
'And remember - every child is different. You can have four kids who all develop language differently at different rates. Just a friendly reassurance for those watching.'
The clip showed Ms Rachel sitting with her daughter. She asked the youngster to say things like 'hi,' 'bye,' 'mama' and 'dada' to the camera, all of which Susie said easily
The former preschool teacher, whose real name is Rachel Anne Accurso, 43, has become a massive online sensation thanks to her wildly successful YouTube series
Ms Rachel also chimed in under the comment section, pointing out that her son had a 'severe speech delay' despite being 'extremely bright and wonderful.'
'He didn't really talk until three years old. I did the same stuff with him (actually more because I didn't have two kids),' she added.
'We got him speech therapy/early intervention starting at 15 months. Get help - sooner the better.
'This shows that kids are different and you shouldn't feel bad! I thought everyone knew about my sweet boy struggling with speech. Love!'
According to the American Speech-Language-Hearing Association, babies should be able to say one to two words by 12 months.
But Happiest Baby notes that if your one-year-old isn't talking yet you shouldn't worry.
'As long as your one-year-old regularly experiments with the intensity, pitch and quality of sounds they make, (somewhat) understandable words are on the tip of their tongue,' the outlet said.
It added that parents should start to worry if their baby is not gesturing at 12 months, has trouble imitating sounds at 18 months, prefers gestures over vocalizations at 18 months and has difficulty understanding simple verbal requests at 18 months.
She launched her now-massively successful channel Songs for Littles in 2019, after she said she struggled to find online resources to help son Thomas when he developed a speech delay
Her videos consist of her singing a combination of covers and original children's songs that help youngsters with their pronunciation and language skills
In a text overlay during the video, Ms Rachel clarified that she doesn't normally tell her daughter to perform or ask her to say certain words.
'I don't say "say ball" or ask her to say things a lot when we are playing. I just play, have fun and say the word slowly,' she wrote.
'I do ask kids to say things on our show because it's harder through the screen to get them to say things.'
The social media star launched her now-massively-successful channel Songs for Littles in 2019, after she said she struggled to find online resources to help son Thomas when he developed a speech delay.
Her videos consist of her singing a combination of covers and original children's songs that help youngsters with their pronunciation and language skills.
Before launching her popular channel, which she runs with her Broadway star husband, Aron Accurso, she worked as a music teacher at a preschool in New York City.