WHY

So we went from laughing baby yesterday to 102.5 and up fever today. What is going on here? She has been asleep since 5:45, its 9:30, and all she does is cry and go back to sleep. So of course when I call the Dr. he gives me the dreaded F word and I panic! Why does my poor sweet girl have to be sick again?? Send your hugs and kisses and prayers her way.