A nurse is preparing a child for a lumbar puncture. In which of the following positions should the child be placed for the procedure?

A. The prone position is not suitable for a lumbar puncture as it does not facilitate access to the lumbar spine. B. The lateral position, with the child curled up in a fetal position, is ideal for a lumbar puncture as it opens up the spaces between the vertebrae and allows easier access to the spinal canal. C. The supine position may be used after the procedure to promote comfort and healing but is not ideal during the lumbar puncture. D. Semi-Fowler's position is not appropriate for the procedure itself but may be used afterward to promote comfort and reduce pressure on the site.