If you haven't heard about 'Wonder Weeks', I am here to tell you they exists and can make your life fairly miserable. With K I didn't really know about these and though we had periods of time of rocky transitions, I either just thought it was normal or it wasn't that bad. Little T is a whole other story.
There are periods of time that I just really don't know what to do with this kid. The clingy, whiny, falling apart if I leave the room dictator. Not to mention just not sleeping well for over a week. I will start to questions everything, is it the food, her teeth, separation anxiety? And I am sure it at lot of those things, but then I will look up on the wonder weeks graphs. (http://25.media.tumblr.com/80fadd74a429cb9f3e72b2eeadb5a379/tumblr_mjx4btzCtr1rogvd6o1_500.jpg) This a chart that list a babies 10 fussy periods, the linked graph is a shorter version it goes past year in other graphs. But, anyway these wonder weeks are periods of time that your infant may be going through a large amount of development and thus be extra fussy.
Little T most have a copy of this graph in her crib that she consults regularly. She follows it to the day practically. I will always be questioning other things, look up the graph and there she will be right in the middle of a stormy week. And then to the day, she will slowly turn into her normal happy baby self again. I love it too because it gives me hope when we are in the thick of it, just a few more days left and it should get better.
Of course until the next wonder week...