Jessa Duggar Seewald and Ben Seewald welcome their second baby boy

Family of four alert!

TLC star Jessa Duggar and her husband, Ben Seewald, welcome their second child on Monday -- a baby boy. The Duggar daughter shared the happy news with PEOPLE.

We are so happy to announce the arrival of our sweet second son," the couple told PEOPLE. "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 couple revealed that they were expecting their second child in fall of 2016 and at the time they said they were excited that their son, Spurgeon, would be taking on the role of big brother in 2017. At the time the pair said, "2017 is shaping up to be a wonderful year already, and we know Spurgeon will do a great job in his new role. Having Spurgeon has been such a wonderful blessing, and we cannot wait to see the face of this sweet new baby (or babies!)."

The couple have not announced the name of their baby son just yet, but it will likely have just as a unique moniker as their firstborn.

Jessa, 24, and Ben, 21, got married in November 2014, and said they were definitely eager to grow their family from the start. They are in good company too, since Jessa's sister and co-star on "Counting On," Jill Duggar, is also expecting her second child in 2017.

Congrats to the whole family.

PHOTOS: See some fun family photos