How to Handle Newborn Diarrhea Accompanied by Vomiting and a Curd-Like Substance?

The newborn started having diarrhea from 6 PM last night, and by 10 PM had had multiple episodes of diarrhea, accompanied by continuous crying and discomfort. Additionally, the baby suddenly vomited, with the vomit being thicker, resembling curd. The baby is only 16 days old and has been exclusively breastfed for the past two or three days after previously being on formula milk. Inquire about the cause and coping methods.
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