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

A. Uses thumb and index fingers in a pincer grasp: A true pincer grasp generally develops closer to 9 months of age. At 6 months, infants use a raking grasp with the whole hand rather than refined finger coordination. B. Lateral incisors: The first teeth to erupt are typically the lower central incisors, often around 6 months. Lateral incisors usually emerge later, between 9 to 13 months. Therefore, finding lateral incisors would be less common at exactly 6 months. C. Closed posterior fontanel: The posterior fontanel normally closes between 6 to 8 weeks after birth, so it should be closed by 6 months of age and is an expected finding at this age. An open posterior fontanel at 6 months might warrant further investigation. D. Sitting steadily without support: Most infants begin to sit without support around 7 to 8 months. At 6 months, they may sit with minimal support but do not yet have steady independent sitting.