Why do I always get sick?

Why do I get sick every year before birthday?
I always get sick a week before my birthday and it happens every year. My parents always tell me that it's happened since i was baby. And I get like high fever, stomach flu, running nose, coughing, etc...

I know I was premature baby, born 3 months early, and born at 2lbs. But I'm sure that's not why.

Is there a reason why I get sick every year a week before my birthday?
My birthday is on Feb 9th.
i'm not freaking out or anything. I just realize it and it's just strange. But a good strange
 
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