Any advice for my 3 week old that is gassy and fussy?

My daughter jut turned three weeks today and for the last couple days has been super gassy and fussy. Before the last couple days she would eat sleep eat sleep no issues day or night. But it seems she is extra fussy and gassy at night and even today a bit fussy during the day too. She's screaming and straightening her legs a lot. I exclusively breast feed and she is pooping and peeing enough. I dot eat a lot of dairy mainly cheese in foods my fianc

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