Jessa Duggar is counting down the days until her second child is born while documenting her pregnancy progress with fans on social media.

The 24-year-old Counting On star shared a split-screen photo of herself Friday, January 27 on Instagram in which she compared her appearance at 39 weeks during both of her pregnancies.

"First - second #39weeks #BabySeewald2," Duggar captioned the side-by-side image, adding emojis of two hands pointing at each picture.

At 39 weeks in her first pregnancy, Duggar took a selfie wearing a long-sleeve white shirt with her hair pulled back in a bun. This time around, she took a selfie wearing a short-sleeve black shirt with her long locks down and brushed over one shoulder.

The size of the baby bump looks almost identical in both photos, while Duggar also cupped her stomach each time with her right hand.

In early December, Duggar shared a similar comparison -- a current progress picture alongside a throwback shot of her belly -- at 31 weeks into both of her pregnancies. 

Duggar's second child with husband Ben Seewald is due next month. Duggar celebrated her baby shower with about 130 of her closest friends and family members last week, according to Us Weekly.

The couple announced in late August they're expecting Baby No. 2.

Duggar and Seewald are already parents to son Spurgeon Elliot, who was born November 5, 2015, just about one year after the couple got married.