Just Being 2?

Since we got back from vacation #2, Elias has been super duper crabby. He doesn't want to do anything...is hitting, pouting, whining, and just down right not a pleasure to be around. I'm wondering if it is because he still has a bit of a cold, he learned some bad behavior from all of his cousins (none of them seemed THIS bad), or if he is just being 2. He was born in April, which means he is 2 for quite a while longer. Ugh.