I am a nurse, but I don't play one on TV, LOL!! Really though, if something is waking the baby all of a sudden, there is something definately amiss. My guess would be gas, teeth or ears. THE BEST thing for teething is Hyland's teething tablets. They are homeopathic, and over the counter. They melt on the tongue in a second, and they will make the difference of a lifetime. Give them SEVERAL and wait 10 minutes, and you will have a new baby. If it's ears, you need to get to the doctor TOMORROW. Sometimes its a subtle change that can lead to big trouble. I would try the teething tablets TONIGHT, they have them in the baby section at walgreens. They are in a light blue and pink box.