Quoting Renea2009:" We feed on demand she's just not demanding today. Didn't know how long I should let her go before I should start to worry about some underlying cause"
I would say longer than 24 hours. Is she teething at all? It's not all that unusual for the babies to have 'off' days too sometimes. Sometimes they can have nursing strikes. Have you looked at http://kellymom.com/ before? It's an awesome site that has some tips and tricks on how to handle all of this breastfeeding stuff. I remember being on there a while back when one of my kids wasn't eating like he was suppose to.