Final answer:
The priority goal of care for a 7-month-old infant with acute gastroenteritis is oral fluid intake.
Step-by-step explanation:
The priority goal of care for a 7-month-old infant with acute gastroenteritis is oral fluid intake. Acute gastroenteritis is characterized by symptoms such as diarrhea, vomiting, and dehydration, so it is crucial to ensure that the infant receives enough fluids to prevent further dehydration. Oral rehydration therapy, which involves giving a solution of water, salts, and sugar, is often recommended for the treatment of gastroenteritis.