Look, breastfeeding is an incredible natural wonder that is rewarding for both parties physically and an indescribable way to bond with your kid, but if one person in the universe takes it too far it's Lysa Arryn, the helicopter mom extraordinaire.
Though it's totally understandable that Lysa wants to protect her only son, being coddled in the GOT world usually doesn't get you very far. And there's absolutely no question this lady is a few cards short of a deck, if you catch my drift. In the first season it's crystal clear how dependent her son Robin is on her. She's literally shown, in the midst of a serious convo about war, breastfeeding Robin who looks to be about 10 years old.
And what's more, Lysa is completely delusional when it comes to her son's capabilities, which can be dangerous. While she thinks he's strong, brave, and independent, in reality his character wouldn't last a nanosecond on his own outside the castle walls. And to make matters worse, Littlefinger gave Lysa the old heave ho down the skyhole, so now Robin really has to tough it out alone. Lysa's serious need of a reality check puts her in sixth place.