I believe in being able to do it in public spaces, but I think that the mother should attempt modesty as well...different if you are just with friends etc. Modesty is easy in cool weather with a tiny baby and as things get warmer and baby gets bigger it gets more difficult but you can still turn to the side or whatever usually. When the kid gets old enough to have a conversation about it...might be an idea to reserve for nighttime feedings..but that is up to parents. Some women can be pretty blatant...and anthropologists have pointed out that nursing is not the only major purpose of the breast...otherwise humans would be sort of like apes..not too much there..it has evolved as a strong visual cue to inspire mating behavior and to dismiss that aspect of it is ignoring biology.