My 3 month old baby hasn't pooped in 48 hours is this normal?

My baby is just under 3mts old and normally passes stools at least once a day, however she hasn't done so for the last 48 hours and i'm starting to get a little concerned. She's pure breastfed and seems ok. I just need to know if this is normal or not or if there's anything i could do to help her.
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