What is the recommended position for an infant undergoing a lumbar puncture?

The recommended position for an infant undergoing a lumbar puncture is side-lying while avoiding neck flexion. This position is crucial because it allows access to the lumbar space while providing the necessary support and comfort to the infant. Keeping the infant in a side-lying position helps to flex the spine slightly, which opens the intervertebral spaces and facilitates the procedure.

Avoiding neck flexion is equally important, as excessive flexion can increase intracranial pressure and potentially complicate the procedure or put the infant at risk for complications. This position also enhances stability and reduces the infant's anxiety, as they are less likely to feel threatened or uncomfortable compared to other positions.

In contrast, positioning the infant flat on their back would not provide optimal access for the procedure and may increase tension in the back muscles, making it more difficult to complete the lumbar puncture. Sitting upright is not appropriate for a lumbar puncture, as it does not allow for the necessary spinal curvature for ease of access. Positioning the infant on their stomach is also not suitable, as this does not facilitate the best access to the lumbar region and could cause distress or discomfort for the infant.