A nurse is assessing a one-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 prone position. At one month old, infants should be able to raise their heads briefly when lying on their stomach. This is an important milestone for neck muscle strength and control. The nurse should report this finding to the provider as it may indicate developmental delays or medical issues. Choices A, C, and D are typical developmental milestones for infants at one month old and are not cause for immediate concern. Sitting without support and bringing objects to the mouth typically develop around 6 months, and picking up objects with fingers develops around 9 months.