Curry posted a photo of Canon W. Jack Curry on Wednesday.
The couple first announced that they were expecting back in February.
Riley became an internet sensation in 2015 when she joined her father at a postgame press conference.
The Curry family is well known across the Queen City as Stephen's father Dell played 10 seasons for the Charlotte Hornets.
Ayesha Curry has been open about how her third pregnancy was a bit hard.
She added, "Family of 5!" According to Ayesha's Instagram, Canon was born on July 2, 2018 and his sisters Riley and Ryan Curry couldn't be happier to have him. "I'm bless! Canon W. Jack Curry".
However, the mother-of-three's pregnancy journey hasn't exactly been smooth sailing. "Pray that it sticks for me y'all!"
Ayesha Curry, a TV host and cookbook author, said in April that she had been hospitalized five times since January during her third pregnancy.
Steph also confirmed the news with a photo from the hospital room. "I think I'm starting to turn a corner though!"