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 checkup 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 for an apical rate for 1 minute,and assess for any normal irregularities such as sinus arrhythmia.
C) Assess the infant's BP by using a stethoscope with a large diaphragm piece to hear the soft muffled Korotkoff's sounds.
D) Watch the infant's chest,and count the respiratory rate for 1 minute because the respiratory pattern may vary significantly.