Smelly poops from breastfeeding?

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Hi all, my son is a week old and I'm breastfeeding. The last few days he has had really smell poops and farts. And he poops a lot - seems like he does during each feeding. Does anyone know if this is normal? I thought breastfeed babies weren't supposed to have smelly poops but I'm not sure where I heard that. His poops are a yellow mustard/rusty color and I do think that's normal. Thanks for any help!