The Duggar family continues to grow!

Josh Duggar, 23, - the eldest son of Jim Bob and Michelle - and wife Anna, 22, welcomed their second child on Wednesday, a source told People.

PLAY IT NOW: How Do The Duggars Make Their Huge Family Work?

The couple is not releasing the name of their little one just yet, but are said to be sticking with their "M" theme.

The couple's new son weighed 8 lbs., 5 oz., and arrived at 5:55 PM in Tontitown, Ark., where big sister MacKynzie, 20 months, was born.



The newest Duggar is very close in age to his Aunt Josie (Jim Bob and Michelle's youngest child, who was born premature, but is now healthy), who is only 17 months old.

"I think of Josie being born at only 25 weeks," Josh told the mag prior to the birth of his son, "and it makes us think about how precious life is and what a blessing each child is."

The Duggars are back on TLC this Sunday in "19 Kids: First Grandson" at 8 PM.