**Question:** According to EVINCE fast breathing in 5 mth child is defined as -

A. more than 60 breaths per minute
B. less than 30 breaths per minute
C. more than 40 breaths per minute
D. more than 50 breaths per minute

**Correct Answer:**

**Core Concept:**

Fast breathing, also known as tachypnea, is a condition where a child exhibits a significantly higher breathing rate than normal. In infants and children, normal breathing rates are defined as follows:

- Birth to 1 month: More than 60 breaths per minute (A)
- 1 month to 1 year: Less than 60 breaths per minute (A)
- 1 to 5 years: Less than 40 breaths per minute (C)
- 5 to 12 years: Less than 25 breaths per minute (C)

**Why the Correct Answer is Right:**

In the context of the question, fast breathing in a 5-month-old child is defined as more than 40 breaths per minute (option D). This definition is appropriate for the age group mentioned in the question, which is 5 months, as the normal breathing rate for this age group is less than 40 breaths per minute.

**Why Each Wrong Option is Incorrect:**

A. More than 60 breaths per minute (option A) is correct for infants less than 1 month old, where normal breathing rate is more than 60 breaths per minute.
B. Less than 30 breaths per minute (option B) is incorrect for children between 1 month and 1 year old, where normal breathing rate is less than 30 breaths per minute.
C. More than 40 breaths per minute (option C) is incorrect for children between 1 and 5 years old, where normal breathing rate is less than 40 breaths per minute.

**Clinical Pearl:**

Understanding these age-specific breathing rates is essential for early identification and management of respiratory distress in infants and children. Fast breathing in children can be indicative of various conditions, including respiratory infections, asthma, or congenital heart disease, necessitating prompt evaluation and intervention.