06/07/2013 at 05:45 PM EDT
Meet Marcus Anthony Duggar!
Josh and Anna Duggar introduce their newest addition
, born Sunday morning.
"We are so thankful that mom and baby are well! We are blessed to have our family close as we celebrate this gift from God," the couple told PEOPLE Friday.
Josh – the eldest of Jim Bob and Michelle Duggar's 19 children – and Anna are already parents to daughter Mackynzie, 3½, and son Michael, who turns 2 this month.
The couple had the whole family over to meet Marcus, with the third-time grandmother looking especially smitten.
Josh and Anna documented the arrival of their new addition on 19 Kids & Counting: GrandDuggar Makes 3!
, which premieres Sunday, June 16, at 8/7c on TLC.