Hi, I have to tell you that it's most likely just a stage because my son just went through the similar one. He just turned one about a month ago. He was perfectly fine and generally a happy baby up until his first year check-up. He developed low-degree fever and horrible rash 7-8 days later. For about a week and a half, he kept getting up in the middle of the night, asking to be held for no particular reason (I think the mild sickness and vaccines made him uncomfortable, but still have no clue why). Some nights, he got up twice just to be held. Before the one year checkup, he almost always slept through the night since 3 months, so I was concerned. Furthermore, he became really, really whinny and inconsolable for two-three weeks after the immunization. All he wanted was me holding him. Then something magical happened, he suddenly is a happy boy again. Plus his motor skills and walking have gotten really improved. He also started to really try talking to me, trying to figure things out by himself, exploring all sorts of things all by himself, etc. Your case sounds so familiar to me, because I was just there a couple of weeks ago. I was so worried that I ended up seeing his doc three times. His rashes turned out to be somewhat rare side effects of MMR vaccines - believe me they looked so horrible, looking like measles. I think all of the "bad boy" stage just came around along with the sickness. During the whole time my little boy was physically uncomfortable, fighting against MMR side effects. Of course I don't know if that's the case for you too, but I would think MMR vaccines can possibly be one factor. My older daughter never showed any reactions or had side effects from any vaccines, but my younger one is just not like his sister. Well, I think the stage will pass eventually whatever the reason may be as in my case. Hang in there and try to understand your baby boy...all he can do is cling to his mommy when he needs help!