Originally believed to be pregnant with twins, McCready's spokesperson tells E! News that she and her doctors "misinterpreted" the initial sonogram.
"Zayne is truly a blessing and a joy," McCready and boyfriend David Wilson announced in a statement. "It was a long and trying pregnancy; we're so happy he's here. There are no words to convey how happy we are."
This is McCready's first child with Wilson. The singer has a six-year-old, Zander, with her ex Billy McKnight.