Final answer:
An 18-month-old child with diarrhea should consume an additional 100 mL of fluid after each loose stool, based on the guideline of 10 mL/kg and assuming an average weight of a child that age. It is important to consult a healthcare professional for personalized advice.
Step-by-step explanation:
For an 18-month-old child with one stool of diarrhea, the amount of oral fluid that should be consumed to compensate for the fluid loss is not explicitly specified in the provided reference. However, general guidelines for rehydration suggest that after each loose stool, children should consume an additional 10 mL/kg of body weight. For example, assuming an average weight of about 10 kg for an 18-month-old child, this would equate to approximately 100 mL.
It is important to consult a healthcare professional for personalized medical advice, as fluid needs can vary based on the individual child and the severity of the diarrhea. Moreover, the provided reference about the risk of blood loss and fluid availability does not directly apply to the rehydration needs of a child with diarrhea.