Acute stridor in an infant could be suggestive of:

Rationale:
A. NSAIDs may help with pain but do not treat the underlying inflammation of the facial nerve in Bell’s palsy.
B. Third-generation cephalosporins are antibiotics and are not indicated unless there is a concurrent bacterial infection.
C. Gabapentin is used for neuropathic pain but is not first-line therapy for Bell’s palsy.
D. Prednisone, a corticosteroid, is the most widely accepted empiric treatment for Bell’s palsy. It reduces inflammation and edema of the facial nerve, improving the likelihood of recovery, especially when started early.

Rationale:
A. While the newborn liver has some immaturity, the main reason for vitamin K administration is not liver production alone.
B. Hemolysis of fetal red blood cells does not significantly affect coagulation factor levels requiring vitamin K.
C. Newborns receive vitamin K through breast milk or formula, but the immediate postnatal administration is not due to dietary deficiency.
D. Newborns are born with a sterile gut, lacking the intestinal flora that synthesize vitamin K. This predisposes them to vitamin K deficiency and increases the risk of hemorrhagic disease of the newborn, so prophylactic vitamin K is administered shortly after birth.