“Ya know, a month old, and already takin’ my first steps. #HenryWilberforceSeewald,” the reality star, 24, captioned the cute shot.
Duggar and husband Ben Seewald, 21, welcomed their second child on Feb. 6.
“We are so happy to announce the arrival of our sweet second son,” they shared.
The statement continued:“He was born at 4:26 a.m. this morning, weighing 8 lbs. and 11 oz. and measuring 21 3/4 in. long. Mom and baby are both doing well. We are so thankful to God for this precious new gift of life and are excited to be a family of four! Thanks to everyone for your prayers and well wishes!”
The Counting On stars are also parents to 17-month-old son Spurgeon.
Counting On airs Mondays (9 p.m. ET) on TLC.