Final answer:
The finding that requires immediate intervention in a 2-month-old infant is the presence of swollen lymph nodes in the throat and armpits, as well as swelling and tenderness of the spleen.
Step-by-step explanation:
The finding that requires the most immediate intervention in a 2-month-old infant would depend on the specific clinical presentation. However, based on the provided information, the most concerning finding is the presence of swollen lymph nodes in Olivia's throat and armpits, as well as the swelling and tenderness of her spleen.
These findings may suggest an infection or inflammation, such as a viral or bacterial infection. Immediate medical attention is necessary to determine the cause and provide appropriate treatment.