The happy development came via Instagram
ANNA DUGGAR SAYS 'PAST 1
"As we watch our children she continued, adding the hashtag "littleduggars."
Duggar also posted a pair of clips in which the couple's kids were handed letters of the alphabet and worked
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The message is read on the floor.
The couple are already parents to Mackynzie, Michael, Marcus, Meredith and Mason
Fox News' Kathleen Joyce contributed to this report.