Jenner, 20, runs Kylie Cosmetics in addition to appearing in her family’s long-running reality show “Keeping up with the Kardashians.”
The baby’s name was not immediately announced. She was born in Los Angeles on February 1.
Jenner is normally a busy social media machine-feeder. But her pregnancy was a relative blackout, which she said was her decision.
“I knew my baby would feel every stress and every emotion. So I chose to do it this way for my little life, and our happiness,” she said in a statement on Twitter.