Kylie Jenner gave birth to a baby girl on February 1. Kylie Jenner/YouTube Kylie Jenner announced the birth of her daughter in an emotional Instagram post on Sunday. Jenner also posted a YouTube video, entitled "To Our Daughter," that gives a glimpse into her pregnancy. People on Twitter are reacting to the emotional post, and can't contain their happiness and excitement. Some Twitter users expressed their respect for Jenner keeping her pregnancy to herself. INSIDER has reached out to representatives for Kylie Jenner for comment.