The baby's name has not been released. He is the first child for Seewald and her husband of one year, Ben, 20.
The baby is also the sixth grandchild for Jim Bob and Michelle Duggar, and the third one born this year. Jill and Derick Dillard welcomed son Israel in April, and Josh and Anna Duggar had their fourth child, Meredith, in July -- ironically on the day TLC canceled 19 Kids and Counting in the wake of Josh's child molestation scandal.
Jessa and Jill can next be seen on Counting On, TLC's upcoming three-part special focused on the sisters.