This is not a simple question to answer without being able to see your little newborn baby.Her vomiting could be due to overfeeding but then her stools would be bright yellow and she would pass more than 3 stools a day. She may have reflux, but then her stomach would not feel hard. There are other causes of vomiting in newborns and to be on the safe side I suggest that you ask your paediatrician to see your baby.
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