Kourtney Kardashian -- I'd Let My Kids BREASTFEED from Kim's Boobs

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

Kourt appeared on the "Today" show this morning with Kim and said she's not weirded out by the idea of letting her kids suckle from multiple Kardashian teats.

Kourt explains, "That's what they did back in the day."

TMZ spoke with a rep for the La Leche League -- an international breastfeeding awareness group -- who says, while it's true wet nurses were used in the past, it's less common today "due to awareness of pathogens that can be transmitted in milk."

Fun Fact -- Salma Hayek used her mom boobs to feed a bunch of random babies in Africa a few years ago ... and didn't receive one single complaint from the babies.