A nurse is assessing a 6-month-old infant at a well-child visit. Which of the following findings should the nurse expect?

Choice A reason: Sitting without support typically occurs around 7-8 months, not 6 months. At 6 months, infants may sit with minimal support, as trunk control is still developing. Expecting independent sitting at this age is premature, making this an incorrect finding for a 6-month-old well-child visit. Choice B reason: Lateral incisors usually erupt between 9-13 months, not at 6 months. At 6 months, central incisors may begin to appear, but lateral incisors are not typically present, making this an incorrect expectation for a 6-month-old infant during a routine well-child assessment. Choice C reason: The pincer grasp, using thumb and index finger, typically develops around 9-12 months. At 6 months, infants use a raking grasp with the whole hand, as fine motor skills are not yet refined, making this an incorrect expected finding for a 6-month-old infant. Choice D reason: The posterior fontanel typically closes by 2-3 months of age due to cranial bone ossification. By 6 months, a closed posterior fontanel is an expected finding, as it reflects normal skull development, making this the correct expectation for a well-child visit at this age.