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. At 3 months, infants are not expected to have the fine motor skills necessary to pick up objects with their fingers.

B. By 3 months, infants should be able to lift their head and chest during tummy time, and the inability to do so could indicate developmental delays or other health issues.

C. Infants typically cannot sit without support until they are around 6 months old.

D. The ability to bring objects to the mouth develops around 4 months of age, so it is not expected for a 3-month-old infant to do this consistently.

A. Puberty might be delayed if scrotal changes have not occurred by the age of 11 years: This statement is accurate because the lack of scrotal changes by the age of 11 years may indicate delayed puberty, prompting further evaluation by a healthcare provider.

B. Growth spurts in height occur toward the end of midpuberty: Growth spurts in height typically occur during midpuberty, rather than toward the end, as adolescents experience a rapid increase

in skeletal growth.

C. Changes in the voice signal the beginning of puberty: While changes in the voice, such as voice cracking and deepening, are indeed part of puberty, they usually occur later in puberty, not necessarily at the beginning.

D. Gynecomastia commonly occurs during late puberty: Gynecomastia, the development of breast tissue in males, typically occurs during mid-puberty and may persist into late puberty but is not exclusive to that period.