Kim, 32, gave birth to her and rapper Kanye West's daughter June 15.
Kourtney, mother of son Mason, 12, and 11-month-old daughter Penelope, believes that Kim's life is not going to be the same now.
"Kourtney has told Kim that she has no idea what she's in for as a mom," radaronline.com quoted a source as saying.
"Kim thinks that she is just going to live her life exactly the way she did before now just with a little baby along with her.
"But Kourtney has told her that her life is going to completely change and she's going to be totally surprised at everything," the source added.
--IANS (Posted on 19-06-2013)