Certified Medical Assistant (CMA AAMA)Clinical Workflow and Patient IntakeMedium
A medical assistant obtains a respiratory rate of 45 breaths per minute on a healthy, calm 3-month-old infant during a well-child visit. How should this finding be interpreted?
- AAn error, as infant respiratory rates should equal adult rates
- BIndicative of bradypnea requiring immediate intervention
- CWithin normal limits for the patient's age
- DIndicative of tachypnea requiring immediate intervention
Show answer & explanationAnswer & explanation
Correct answer: C. Within normal limits for the patient's age
The normal respiratory rate range for infants (0-12 months) is approximately 30-60 breaths per minute. A rate of 45 breaths per minute in a calm infant falls within this normal range.
Why the other options are wrong
- A. Infant respiratory rates are normally much higher than adult rates (12-20/min).
- B. Bradypnea would be an abnormally low rate, not 45.
- D. 45 is not above the normal infant range, so it is not tachypnea.
Infant Respiratory Rate Norms
Normal respiratory rate for infants aged 0-12 months ranges from approximately 30-60 breaths per minute, higher than adult norms.
- Adult normal RR: 12-20 breaths/min
- Infant normal RR: 30-60 breaths/min
- Rates decrease with increasing age toward adulthood
Memory trick: Babies breathe faster—small lungs need more breaths per minute.