Here are his symptoms: He's been very fussy the past few days, he's not been sleeping at all during the day (maybe 1 hour total), he is constantly chewing on his fist, and he's running a low grade fever. The only thing that concerns me, is that he's spitting up more than usual. Not throwing up, but just more spit up. Could he be teething this early? He was 3 months on Monday. I have some teething tablets to give him. Last night his fever got up to 100.2 and I have him a little Tylenol. I called my pedi this morning and I'm waiting on a call back.