A 3-month-old is admitted with severe diarrhea.Yesterday, the infant weighed 11 pounds (5 kg). Today, this infant weighs 9 pounds, 8 ounces (4.3 kg). Based on this information, the nurse documents that the infant has:

The correct answer is Choice C.Choice A rationaleFailure to thrive is a condition where a child does not gain weight or grow as expected. While severe diarrhea can contribute to failure to thrive, the immediate concern in this scenario is the significant weight loss indicating severe dehydration.Choice B rationaleMalabsorption syndrome involves the inability to absorb nutrients properly, leading to malnutrition and weight loss. However, the acute weight loss in this case is more indicative of severe dehydration.Choice C rationaleSevere dehydration is characterized by significant fluid loss, which can be life-threatening in infants. The weight loss from 11 pounds to 9 pounds, 8 ounces indicates a substantial fluid loss, pointing to severe dehydration.Choice D rationaleRisk for fluid volume deficit is a potential diagnosis, but the significant weight loss and clinical presentation indicate that the infant is already experiencing severe dehydration.