North, who is seven-month-old, is Kim and her fiance and rapper Kanye West's first child.
Jenner added that it is "remarkable" to see her daughter being such a good mother, reports contactmusic.com.
"She's changed, in a really good way. You watch your baby, have a baby and it's kind of remarkable to see the changes we all go through when you give birth and have a child (who) you're responsible for," Bangshowbiz quoted Jenner as saying.
"Kim's totally in love with North, it's been wonderful to watch," she further added.
Kim-Kanye, who got engaged last year, are set to marry this year.