A- a 6 month old infant with fever, vomiting and diarrhea must be seen in the pediatrician's clinic for a thorough evaluation to rule out dehydration (by assessing skin turgor, if the eyes are sunken, physical activity, presence pf tears upon crying, lethargy, how warm and well perfused the skin is, and the anterior fontanel), and to send stool samples for analysis, rotavirus, and culture.
B- The main concern when a small baby gets diarrhea and vomiting is dehydration, which will lead to the elevation of acid in his blood, which by itself worsens the nausea and vomiting. So the most important step now is to focus on rehydrating the child with oral hydration solution: rehydration will reduce the acid and help the baby receive fluids and keep them down in his/her stomach without throwing them up. Oral rehydration solutions are available over the counter in all pharmacies and should be given slowly using a sterile syringe at a rate of 10-15 mL every 15-20 minutes. If despite doing this measure the baby continues to vomit repeatedly, this mean he/she may require intravenous (IV) fluids.
C- We cannot prescribe medications online.