A nurse is assisting in the care of an infant whose guardian reports intermittent vomiting for several days. Findings upon admission: Exhibits Which of the following actions should the nurse take? Select all that apply.

Measure the infant's head circumference.

Weigh the infant.

Monitor intake and output.

Offer small frequent feedings of thickened liquids.

Evaluate serum electrolyte levels.

Plan to administer a plain water enema.

Implement contact precautions.