A nurse provides care to a 6-month-old infant.Which observation should be reported to the pediatrician?

Choice A rationaleA 6-month-old infant typically grasps objects voluntarily, which is a normal developmental milestone.Choice B rationaleThe posterior fontanel usually closes between 2 to 3 months of age, so it being closed at 6 months is normal.Choice C rationaleIt's expected for an infant's birth weight to double by about 5 to 6 months of age, indicating healthy growth.Choice D rationaleHead lag in a 6-month-old indicates a delay in motor development and should be reported as it can signal neurological issues.