dear user at begining i would like to tell you that diarrhea is very common problem in infants and you need not to worry about that but you should do simple steps....... diarrhea may result from more than one cause but the most common cause in that age viral infection of the intestine .... viral infection causes severe watery diarrhea with vomiting and may lead to complication as dehydration......dehydration is the problem we worry about it because infant loss fluids in diarrhea so you should give your baby oral rehydration therapy and fluids... management at home is surely possible by oral rehydration sachets administered to protect her from dehydration and it is the most important step in management...if you do that your daughter will be fine shortly and improve... if typhoidal infection suspected she would administered antibiotics like cefotriaxone and could be managed at home wish your daughter healthy life