Terrible tweens?

We can refer the age of 13 months to 19months the tweens right? I can't think of any other way to refer to it. But we are experiencing the terrible tweens here at our house. Ash is upset all the time (at least the last 3 days) All he wants is mom's lap, but only if I'm on the sofa. He wants anything you have, even if he has never had interest in it before and only wants it for a second. Blah! It's starting to get quite tiring, and on top of that, I've been sick with a couple different things. A nasty cold, and some kind of stomach bug. Blah blah! Hopefully this phase will pass soon.. . .. . it will right??