It could be teething. my dd is 7 almost 8 months and is cutting her 4th tooth right now. They get the bottom two teeth first and often appear as white spots before they pop throuh. Our ped also told us that she will pull on her ear, which she does when she is in pain.
Do you give tylenol? I would try giving a dose before bed to help ease the pain. If you don't want to give tylenol, try Hyland's teething tablets. They are natural and seem to work pretty well.
there is a birth club of sept/oct babies on the acitivity board under birth clubs. They may have alot of answers for you as their lo's are all the same age.
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hth