Reason #2: "New Day" wasn't the first song that featured Kanye rapping about his unborn child.
Back in 2005, when he was creating Late Registration, 'Ye recorded a track called "Celebration" that featured him rapping about the son that he didn't have yet. On that song, he referred to his son as his "favorite accident" and rapped about getting his girlfriend pregnant when they were just "practicing" (if you catch his drift). But, nonetheless, fatherhood was on Kanye's mind. So, he's been thinking about this moment for awhile now.