A devastated YouTube star who just lost her newborn has slammed online trolls who accused her of faking her son's illness.

Parenting vlogger Brittani Boren Leach recently opened up about the heartbreak of losing her 3-month-old son, who stopped breathing during a nap on Christmas Day.

However, after receiving vile comments of people questioning whether or not her son Crew was even ill, the mum shared a photo of her child's small casket at his funeral on Instagram.

The YouTuber shared an image of her son's casket as she reportedly received vile comments online questioning her son's condition. Photo / Brittani Boren Leach Instagram
The YouTuber shared an image of her son's casket as she reportedly received vile comments online questioning her son's condition. Photo / Brittani Boren Leach Instagram

"Please keep in mind that we can see your comments, questions and conversations with one another," she said on social media.

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"Put yourself in our shoes (which is impossible to do) and ask yourself If you'd want to read what you're about to write or say."

One follower went as far as to ask if the small coffin was real.

In a series of Instagram posts last month, the 29-year-old from Texas, US, documented her son's condition and subsequent death.

She said she rushed her son Crew to hospital when he stopped breathing on Christmas Day and he died on the following Friday.

The mum described how she put him down for a nap at a relative's house, where the family was spending Christmas.

"When I went to check on him, he was not breathing. We are living a nightmare, and I'm dying inside. Please pray for my baby. This can't be real," she wrote on Instagram.

Crew was rushed to hospital where doctors stabilised him with a ventilator.

"This kind of thing only happens to 'other' people. Not me," she wrote.

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"Please continue to pray. Please. I don't think I can go on without him," she posted while Crew was still in hospital.

Leach kept her followers updated on her son's condition.

"Crew's tiny earthly body is still with us, although I know he's already dancing and playing in Heaven," she wrote at one point during the ordeal.

"We have some hard decisions to make over the next 12 hours, that no parent should ever have to make."

"We need prayer now, more than before, specifically prayers for peace and clarity on the decisions that have to be made, and for our hearts, the pain is unbearable," she added.

"I keep thinking that I will wake up from this nightmare, but I don't."

The heartbroken family was then saying a final goodbye to Crew.

"We are making hand and footprint imprints, a family handprint tree and a fingerprint charm," she wrote.

"Jeff and I take turns being strong for each other, and our kids have been so strong. We are just taking things, minute by minute, hour by hour, although it feels like a daze."

She has thanked her friends, family and followers for their support and prayers.

"Hearing a baby cry. Seeing a baby his age. Shopping Nordstrom for the dress I'll wear to my son's funeral," she wrote.

"It's all too much. I'm sorry to vent, but this is my heart. And I need all the prayers to get through this."