Pumpkin stools could be a result of something the mom is eating such as
lots of carrots or ingesting lots of beta carotene.  Is her milk orange?
I've heard of Zantac doing this as well because of acidity changes in the
stomach and bowel.  This may alter the transit time through the body.  How
often is baby stooling?
If weight gain is okay, then all is probably fine.
Chris

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