ebf baby not pooing

My baby is 5 months and for the last few months would poo every single day 1-2 times. Just last week at 5.5 months he went a day without going then 2 days and now it's almost been
4 days and he hasn't gone. He does seem gassy and his last two poos were like peanut butter instead of as liquid as they used to be. I'm getting worried. I haven't changed my diet and he hasn't started anything only breast milk - is this normal ?

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