Thank you for the query.
If it is about vomiting
in infants usually it is very hard to give sufficient amount of fluids when vomiting and diarrhea
is present. That is why, many of such condition should be treated in the hospital and intravenous fluids are necessary. So if the diarrhea is still present after 4 days, you should take your baby to the ER and pediatrician
should decide either admit her to the hospital or not.
Hope this will help.