DH and I had all of our families round on boxing day for a party. BIL and SIl brought their brood of kids round, 7 in total. We had a really good time.
BIL's youngest DD was asking me lots of questions while I was feeding DD (BIL's wife had not BF, so kids had never seen it before)
DN asked what DD was doing to my tummy (Awww) I said that DD was having her dinner as she was hungry, and that DD wasn't doing anything to my tummy. She then asked What is she doing, so I said that it's like when mummy gives her brother (Who's 5 months old) a bottle and that this is my DD's bottle.
DN poked my boob and continued to ask the same question, I don't think she was able to get her head round it IYSWIM. I didn't know how to explain it to her any better, DN is nearly 3 YO.
Her mum told her off for poking my boob, but I told her not to worry as DN was only curious.
How would you explain BF'ing to young kids, or any children that ask questions about it for that matter.