Kourtney Kardashian says she's super excited that her sister Kim is pregnant because Kim will be able to use her mom boobs to feed Kourtney's kids along with her own child.

Kourtney said she's not weirded out by the idea of letting Kim breastfeed her kids:  "That's what they did back in the day."

By the way, a rep for the La Leche League, a breastfeeding organization, said that they wouldn’t advise moms to breastfeed for each other’s babies because of the potential health risks.