A nurse is preparing to measure an infant's vital signs. The nurse should use which of the following sites to assess a heart rate?

A. Pulse rate is increased.

While there may be variations in pulse rate due to factors such as activity level and emotional state, a significant increase in pulse rate would not be a typical finding during an annual check- up for an 8-year-old child.

B. Breathing is diaphragmatic.

As children grow older, their respiratory patterns mature, and they develop diaphragmatic breathing, which is deeper and more efficient than the shallow breathing observed in infants. This change would be expected as the child gets older.

C. Secondary sex characteristics are present.

The development of secondary sex characteristics typically occurs during puberty, which begins around the ages of 9 to 13 in girls and 10 to 14 in boys. At 8 years old, it would be unlikely for significant secondary sex characteristics to be present.

D. Blood pressure has reached adult level.

Blood pressure in children gradually increases with age, but it does not reach adult levels until adolescence. At 8 years old, the child's blood pressure would still be within the pediatric range and would not resemble adult levels.

A. At 12 months, the infant walks independently: Most infants begin walking independently between 12 and 15 months of age, but it's not typically achieved by 12 months.
B. At 7 months, the infant sits alone with some use of hands for support: This is an accurate statement. By around 6 to 8 months, infants develop the ability to sit unsupported, although they may still use their hands for balance.
C. At 9 months, the infant crawls with the abdomen off the floor: Crawling typically begins between 7 and 10 months, but the abdomen may still be close to the floor initially.
D. At 1 month, the infant lifts and turns the head to the side in the prone position: This is an accurate statement. Newborns typically exhibit head control and turning movements when placed on their stomachs (prone position) by around 1 month of age.

E. At 2 months, the infant rolls from supine to prone to back again: Rolling from supine to prone and back may begin around 4 to 6 months, but it's less likely to occur at 2 months.