It gets mentioned on tv shows fairly often but the only time I can remember actually seeing it was in Rome, [SPOILER] where it happens on screen and is actually important to the plot because it reveals who the baby's mother actually is.
I wish breastfeeding was shown on tv more often to normalise it.
Oh, and I just thought of another one. There is some full term breastfeeding (also called "extended" breastfeeding, ie. of an older child rather than a baby), shown in a really bad light.