The new little Seewald will join sibs Spurgeon, 5, Henry, 4, and 1-year-old Ivy.
The news is doubly joyful for the family, following a heartbreaking miscarriage that Jessa suffered last year.
It also means grandparents Jim Bob and Michelle will be busier than ever.
Inquiring minds will no doubt be asking whether this will be the last baby for the Seewalds.
