The 30-year-old went on US programme the Today Show yesterday to promote her new show, Kourtney and Kim Take New York.
And Kim took to her blog after the show to express her opinions on a story they ran about the outbreak of teen pregnancies at a Memphis school, where 90 students had either given birth this year or were pregnant.
She wrote: 'When I think back to when I was 16, there is no way I would even have considered having a baby.
'Having a baby is one of the biggest, and most life-changing decisions a person can make and while I'm not saying that no teen is in the position to raise a child, having a baby so young shouldn't be seen as the trendy thing to do.'
Kardashian said shows like MTV's Teen Mom influence girls to want to have babies at a young age.
The Keeping Up With the Kardshians star added: 'Girls, please, think very carefully before you make these decisions. Talk to your family, friends, teachers, and most of all, be careful.'