## **Core Concept**
Tachypnea in infants is defined by an elevated respiratory rate that exceeds the normal range for their age. The respiratory rate is a vital sign that can indicate respiratory distress or disease. In infants, the normal respiratory rate and the threshold for tachypnea vary by age.

## **Why the Correct Answer is Right**
For infants, specifically those under 2 months of age, a normal respiratory rate is typically considered to be up to 60 breaths per minute (bpm). Tachypnea in this age group is generally defined as a respiratory rate of more than 60 bpm. This threshold is crucial for identifying infants who may have respiratory distress or disease.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is not provided, but any value below 60 bpm would not be considered tachypnea for a 2-month-old infant.
- **Option B:** Similarly, without a specific value, it's hard to assess, but any option not aligning with the definition of tachypnea (more than 60 bpm) would be incorrect.
- **Option C:**
- **Option D:**

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that the threshold for tachypnea changes with age:
- For infants under 2 months, tachypnea is defined as ≥60 breaths/minute.
- For infants 2-12 months, it's ≥50 breaths/minute.

## **Correct Answer:** . 60 breaths/min