Credit: Albert Michael/Startraksphoto.com

Mother knows best?

Kourtney Kardashian -- who welcomed son Mason with beau Scott Disick last December -- has apparently sampled her own breast milk.

"Kourt just admitted that she tasted her own breast milk. Ummmm TMI," her sister Khloe Twittered Thursday.

Kerrie Conway, an international board-certified lactation consultant, tells UsMagazine.com "it's not dangerous" for women to drink their own breast milk.

"Breast milk has nutrients and anti-bodies that can help boost the immune system," she tells Us. (It remains to be seen whether consuming nutrients found in breast milk will improve the quality of a woman's breast milk down the line.)

But the practice is somewhat unusual, she says.

"Occasionally, I'll have a mom say, 'Hey, I tasted my breast milk.' It's not one of those things that's unheard of," Conway tells Us. "But it's not like in my professional career, I run across it daily."

Khloe, 25, says she is still getting used to her sister's breastfeeding ways.

"Wow my sister has changed," she previously Twittered. "She used to whip her boobs out for no reason. Now she does it to feed her child (sic)."