It could be due to a few reasons. Most of the times, it just lasts for a few days. But if prolonged, do seek a PD's or lactation consultant's advice - does she have thrush or any mouth infection? - is it just one breast or both? - tightness in neck muscle - disruption in routine? You can read this article for more info. Hope this helps! Hang in there mummy! http://www.babycentre.co.uk/a8490/when-your-baby-wont-breastfeed
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It could even be early teething. Do check her gums. Or she could be coming down with a cold. If it persists, best to check with a doctor.