The couple first started dating in October 2021 with Jeremiah proposing to her just three months later.
"Frederick Michael Dillard is here! He was born 7/7/2022," she wrote.
The newly-engaged pair are yet to talk about the wedding.
The Duggars and The Bates, who is the favorite? Fans weigh in the pros and cons of both reality star families.
No biography was found.