Right, ahaha. And traveling takes time, too. They fast-forward through a lot of it because no one wants to see that. But I think from King's Landing to Winterfell is supposed to be like a two month journey?
Point is, a lot more time is going by then we actually see. Given how annoying Arya and Bran's stories have been in the past, not showing it all is a good thing.
(Also Fat Walda was married and had a baby too.)