The Duggar daughter, 25, and her husband Derick, 27, married in 2014 and are already parents to 1-year-old Israel David.
“We are so excited to be expecting Dillard baby #2!” the Counting On stars told People.
Jinger Duggar married Jeremy Vuolo in November after only a few months of courtship and Joy-Anna Duggar entered into a courtship of her own a few days after the wedding ceremony.