When they get a little older... the very *best* is when they really want to nurse, and you finally get a chance to latch them on, and they suck suck suck and get that first mouthful of milk, and as they swallow, their eyes roll back in their head, their body relaxes, and it's like they just got a hit of heroin or something. ;-)
Right now, my LO makes noises like he badly needs oiling when he's nursing. Not so besty really. Kinda funny though. IIRC, DS1 didn't make much noise at all when nursing... I had lots of trouble even being able to tell when he was swallowing (finally was able to hear the tiny catch as he held his breath to swallow, but it took a LOT of listening).