Final answer:
The medical assistant should advise the mother to take the baby to a healthcare professional immediately for evaluation and treatment.
Step-by-step explanation:
The symptoms described by the mother, such as lack of activity, weak cry, and absence of wet diapers for 2 days, are concerning and could indicate dehydration in the 8-month-old baby. Dehydration in infants can be serious and requires prompt medical attention. The medical assistant should advise the mother to take the baby to a healthcare professional immediately for evaluation and treatment. Homemade baby food may not provide adequate hydration and nutrition for the baby, so the medical assistant may also suggest offering oral rehydration solution or breast milk/formula more frequently to keep the baby hydrated.