Donald Trump has posted a photo of JD Vance's 'perfect baby boy' after the vice president's wife, Usha, gave birth to their fourth child over the weekend.

'Congratulations! A perfect baby boy for the wonderful Vance family,' Trump wrote Monday.

The President posted a photo of Alec Neel Vance being held by his six-year-old brother Vivek and alongside his four-year-old sister Mirabel.

The Vances announced the birth of baby Alec on Sunday, marking a historic milestone for the executive branch - the first time in 156 years that a sitting vice president has welcomed a child in office.

The last time an incumbent Second Family added a newborn to their ranks was in 1870, when Schuyler Colfax, VP to Ulysses S Grant, and his wife Ellen had a son.

'Usha and the baby are happy and healthy, and our kids are overjoyed to meet their little brother,' Vance wrote on X.

He went on to thank 'the incredible military doctors and staff members of Walter Reed Medical Center and the White House Medical Unit,' describing them as a 'blessing.'

'We are deeply thankful for all they have done for our family,' he added.

Donald Trump posted a picture of Alec Neel Vance, the newborn son of JD and Usha Vance, being held by his brother Vivek, six, and alongside his four-year-old sister Mirabel on Monday

The Vances announced the birth of baby Alex on Sunday, which marks the first time in 156 years that a sitting vice president has welcomed a child in office

Donald Trump, left, and Vice President JD Vance walk to the Tomb of the Unknown Soldier in Arlington National Cemetery on Memorial Day, Monday, May 25

Usha, 40, and JD, 41, first announced that they were expecting their fourth child in January.

Vance revealed in his memoir Communion this year that the couple had decided against more children because of the pressures of public life, until the assassination of his close friend Charlie Kirk last fall changed Usha's mind.

'Something changed for Usha, and not long after we buried my friend, she became pregnant with our fourth child, a boy. One life was stolen from us, but another was given,' he wrote.

Usha has said Erika Kirk's regret about not having more children with her murdered husband was 'very powerful' but not the deciding factor.

'I think I had already started to open my mind to the possibility,' she told CBS Sunday Morning.

The Vances met at Yale Law School, where both graduated in 2013, and married a year later in Kentucky with interfaith ceremonies honoring her Hindu faith and his Christianity.

Vance holds his daughter Mirabel on his lap aboard the Wasp-class amphibious assault ship USS Kearsarge during the Sail 250 parade of ships in New York Harbor, on July 4

Vance, second lady Usha Vance, along with their children Mirabel, Ewan and Vivek, disembark Air Force Two as they arrive in Yerevan, Armenia, in February

Vance, Usha and their children Ewan, Vivek and Mirabel watch an event during the Winter Olympic Games at Milano Ice Skating Arena in Milan on February 6

The family pose during their tour at the Taj Mahal in Agra on April 23 last year

Their pairing has long fascinated Washington. Usha is the daughter of Indian immigrant academics and was raised Hindu in San Diego, while Vance chronicled his chaotic Ohio childhood and his mother's addiction in his 2016 bestseller Hillbilly Elegy.

Usha built the more gilded legal resume of the two, clerking for Brett Kavanaugh on the federal appeals court and then Chief Justice John Roberts at the Supreme Court, before quitting her law firm when her husband joined the Trump ticket in 2024.

Alec joins Ewan, nine, Vivek and Mirabel, and caps a baby boom inside the administration.

Press secretary Karoline Leavitt had her second child in May and deputy chief of staff Stephen Miller's wife Katie recently delivered their fourth.