TIME, a credible news site has stated the relationship between Jay-Z's baby girl, Blue Ivy, and the song they made for her.
"Though there were jokes that Jay-Z and Beyoncé’s child, already the most famous baby in the world, would come out of the womb rapping and singing, no one expected it would actually happen this fast.
Jay-Z released a song on his website welcoming his baby girl to the world (born on Saturday, Jan. 7) entitled “Glory,” featuring “B.I.C.”—or Blue Ivy Carter herself. Hov samples the cries of Blue at the end of the track, making her the youngest kid officially in the rap game."
Source:
https://newsfeed.time.com/2012/01/09/jay-z-releases-glory-featuring-his-daughter-blue-ivys-cries/