The 28-year-old, who was born Belcalis Almanzar, and her husband welcomed the new arrival on Saturday, September 4. The "WAP" singer made the happy announcement on Instagram on Monday, September 6, and shared a photo of her and the 29-year-old in a hospital bed cradling the new baby.
"9/4/21🦕💙🧸," she captioned the family photo.
Fans and friends took to the comments to congratulate the happy couple.
"💙💙," Chance The Rapper commented.
"Congratulations!!!!!😍😍😍😍," Kris Jenner wrote.
"Congrats ! GOD IS THE GREATEST!" DJ Khaled gushed.
"We are so overjoyed to finally meet our son," Cardi B and Offset said in a statement. "He is already loved so much by family and friends and we can't wait to introduce him to his other siblings."
The "Bad and Boujee" singer, who was born Kiari Cephus, shared a photo on Instagram of his wife in the hospital bed while he lay down and cradled the baby. "Chapter 5," he captioned the post.
The "I Like It" hitmaker revealed that she was pregnant in June when she performed with her beau and Migos at the BET Awards. She arrived on stage wearing a Dolce & Gabbana bodysuit with a sheer fabric over her stomach to show off her baby bump.
She also shared a photo on Instagram of a mold over her bump and chest. "#2! ♥️ @offsetyrn," she captioned the pic.
The couple also share 3-year-old daughter Kulture.
The "Red Room" singer is also a dad to Kalea, 6, Kody, 6, and Jordan, 11, from previous relationships.
The couple tied the knot in 2017. The "Bodak Yellow" singer filed for divorce in September 2020, however, the co-parents later reconciled.
They have yet to reveal their son's name.