A nurse is assessing a 3-month-old infant. Which of the following findings should the nurse report to the provider?

The correct answer is B: Inability to raise head when in the prone position. At 3 months, infants should be able to lift their heads while in a prone position, which is essential for developing neck and upper body strength. This milestone indicates the maturation of the infant's neck muscles and neurological development. If the infant cannot raise their head, it may suggest a delay in motor development or underlying issues that require further evaluation. Choices A, C, and D are typical developmental milestones for a 3-month-old infant, so they are not as concerning as the inability to raise the head. Reporting this finding to the provider allows for early intervention and appropriate management.