A university lecturer has come under fire for attacking Barron Trump and his choice of wardrobe.

Jodie Beggs, a Boston based 'behavioral economist', mocked the 11-year-old on Twitter, writing on Monday: 'Barron Trump is wearing a shirt that reads "The Expert" and I just threw up in my mouth a little.'

She was referring to the $29.50 J. Crew grey and blue garment that Barron was pictured wearing as he arrived at The White House with his parents on Sunday.

Beggs, who claims to have worked for Northeastern University, was savaged by Trump fans and impartial Twitter followers who condemned her for picking on a child.

Economist Jodi Beggs (left) was slammed after mocking Barron Trump's 'expert' t-shirt on Twitter

She offered no remorse and later, while trying to defend them, said the child's shirt 'made him look like a jerk'.

The schoolboy, the youngest of President Trump's five children, has just relocated with his mother from their home in Manhattan to Washington DC.

He wore the shirt for his flight to his new home on Sunday after spending the weekend with his parents in New Jersey.

Beggs' tweet is not the first cruel taunt he has faced since his father launched his political career.

Both Donald and Melania Trump have lampooned critics who appeared to attack him, including a SNL writer who was fired for saying he would become 'the country's first home school shooter'.

Unlike Kate Richie, the writer who posted the insensitive tweet then hastily deleted it before losing her job, Beggs offered no apologies for aiming her comment on Tuesday.

The woman attempted to defend her comment on Twitter, claiming she was attacking Barron's parents and not the 11-year-old himself

Barron wore the t-shirt to fly back to The White House with his parents on Sunday on Marine One

Barron's $29.50 t-shirt from J. Crew sold out online after he was pictured in it on Sunday

Beggs attracted criticism for her comment from other Twitter users

Despite the barrage of complaints, she carried on on Sunday and said the shirt made Barron 'look like a jerk'

'Hey Twitter, maybe, just maybe, I'm judging the people that bought him this item and let him wear it in a very public appearance,' she said.

Her critics were not satisfied and accused her of trying to shy away apologizing.

Beggs claims to lecture at Northeastern University

'No matter what the affliction, kids are off limits,' said one unimpressed follower.

Another replied: 'You are nothing more than a very sick individual that feels the need to lift herself up by attacking a child. Grow up and seek help.'

Beggs attempted to argue that because President Trump presents his older, adult children as experts by employing them in his administration, she was right to point out the apparent irony of Barron's shirt.

'His dad has consistently stated that his family members know more than actual experts, so it was an unfortunate visual for an arrival in DC,' she wrote.

Northeastern University distanced itself from the woman when approached, explaining that she hadn't worked for them for over a year.

'Ms. Beggs has not been affiliated with Northeastern for over a year. Her views are hers alone and do not represent those of the university,' a spokesman said.