Did anyone else see this? If you missed it, the scene can be seen on Youtube: http://youtu.be/oNbrKJ_nVZs 
And there is a write-up about it:
There’s extended breastfeeding and then there’s e-x-t-e-n-d-e-d breastfeeding. Last night on episode 5 of the HBO show Game of Thrones, which is a period show based in the middle ages, one character, Lysa Arryn, has a scene where she’s breastfeeding her son which has sent the Internets all a flutter. If you don’t watch the show, it’s a Dungeons and Dragon-esque, medieval smack down amongst wealthy families who try to kill each other in order to obtain as much power as possible. Anyway, as the King’s Hand’s wife greeted her sister along with her dwarf captive, she found her sister Lysa sitting on her throne, breastfeeding her bratty and precocious son who is apparently around 6 or 7 years old.
Sorry, I can't seem to find anything where they are not swearing in the comments...
So - is he too old to be breastfeeding? Do you think that they are simply using the scene to show how crazy the character has become? Do you think having a child actor portray breastfeeding at that age borders on child abuse?