"Usha and the baby are doing well and healthy, and our children are overjoyed to meet their little brother," JD Vance wrote in a post on X.
The US vice president - who is now the father of three boys and a girl - is, like several ministers in the Trump administration, an advocate of large families and has repeatedly urged Americans to have more children.
However, it is unusual for vice presidents to have children while in office. The last time a sitting vice president became a parent was in 1870, when Schuyler Colfax had a son, according to the AP.
