Counting On alum Jeremiah Duggar and his wife, Hannah Duggar, expanded their family with the recent arrival of baby No. 4. “The sweetest moments we’ve ever known,” Hannah, 31, wrote via Instagram on Friday, August 7, sharing a photo with Jeremiah, 27, and their three daughters peeking at a newborn dressed in a knit blue onesie. “Life feels busier than ever, yet we find ourselves trying to slow down to just soak in these days with our littles. And we wouldn’t have it any other way!” Without further announcing the infant’s name, sex or birthday, Jeremiah’s relatives subtly ce...