When an infant with pyloric stenosis is admitted to the hospital, which of the following should the nurse do first? 1. Weigh the infant. 2. Begin an intravenous infusion. 3. Switch the infant to an...

When an infant with pyloric stenosis is admitted to the hospital, which of the following should the nurse do first?

1. Weigh the infant.

2. Begin an intravenous infusion.

3. Switch the infant to an oral electrolyte solution.

4. Orient the mother to the hospital unit.