Many EBF babies go 5-7 days without a poop. VERY common. Both my older DD and now this little DS are like this. As long as he's not showing signs of distress, gassy, uncomfy, very irratible, etc. you're totally fine.
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When he does poop - it should be the same texture, consistency, color, etc that you're used to - and pretty big in volume! Pretty much every time DS poops we can count on a soiled outfit. But since it only happens once a week, it's not so bad.