Melania said luckily Baron is a strong teenager and showed no symptoms, adding that she was glad the three of them got the disease at the same time.
The first lady has since fully recovered and both she and Barron have tested negative for COVID-19.
The first lady said her son had since tested negative for the virus. "He had it such a short period of time I don't even think he knew he had it". "And Barron is lovely, and he's free, free".
De Blasio 'deeply concerned' over potential second wave of COVID-19 in NYC
Mayor Bill de Blasio expressed concern over the possibility of a second wave as New York City continues to fight the spread of COVID-19.
Ms Trump went on to say that vitamins and healthy food helped in her recovery as well as medical care from the president's doctor.
The news, which had been kept under wraps despite global attention on Trump's own health, thrust public attention firmly back on the pandemic and in particular on an outbreak within the supposedly highly secure White House over the last two weeks.
While her husband, U.S. president Donald Trump, took a catalogue of pharmaceuticals - including remdesivir, the steriod dexamethasone and Regeneron, an experimental antibody drug - the First Lady credited her diet and "fresh air" for helping her to recover.
In the post, entitled My Personal Experience With COVID-19, she said: "Recovering from an illness gives you a lot of time to reflect".
Alabama's Nick Saban tests positive for Covid-19
Saban said Alabama hasn't "had any indication" of an outbreak within the team. The Crimson Tide (3-0) is coming off a 63-48 win over Ole Miss on Saturday.
Barron Trump is the President's fifth child, and only child with current wife Melania. However, the first lady noted that the symptoms "hit [her] all at once".
She encouraged everyone to live the healthiest life they can by imbibing a balanced diet, fresh air, and vitamins into their daily routine.
"Barron's fine", the president told reporters as he departed the White House for a campaign trip to Iowa. The disease has killed more than 216,000 people in the USA and caused almost 7.9 million infections here, according to the latest count from Johns Hopkins University.
The US Department of Justice claims the author of "Melania and Me: The Rise and Fall of My Friendship with the First Lady" breached her non-disclosure agreement (NDA) and that she failed to submit a draft copy of the book for government review.
Mrs. Trump acknowledged her family was "fortunate" to have received "the kind of care that we did".
"TéléCovid" : il faut que Castex arrête d’essayer de dire des trucs
C'est Cédric O . lui-même qui aurait poussé pour relancer l'application. C'en est bientôt fini de la première version de StopCovid .