A 4-Month-Old Child Is at the Clinic for a Well-Baby

A 4-month-old child is at the clinic for a well-baby check-up and immunizations.Which of the following actions is most appropriate when the nurse is assessing an infant's vital signs?

A) Palpate the infant's radial pulse and note any fluctuations resulting from activity or exercise.
B) Auscultate an apical rate for 1 minute and assess for any normal irregularities,such as sinus arrhythmia.
C) Assess the infant's blood pressure by using a stethoscope with a large diaphragm piece to hear the soft muffled Korotkoff sounds.
D) Watch the infant's chest and count the respiratory rate for 1 minute because the respiratory pattern may vary significantly.