Spinal cord Position in Neonates At Lumbar puncture (SPINAL)

The participants will be infants admitted to the hospital who require lumbar puncture. There are no exclusions. The spinal cord will be examined by ultrasound using linear array probe in mid sagittal (up and down the body) and transverse planes (across the body) and location of the termination of the spinal cord defined in relation to surrounding vertebral bodies. Ultrasound examinations will be performed by 2 practitioners, Neonatal Consultants or Senior Neonatal Trainees who are experienced in the use of ultrasound. They will have training in the method for examination of the spine and will be allowed to familiarise themselves with this technique. The procedure will be performed twice by the first observer and twice by a second observer who is blinded to the results of the first. Each observation should take approximately 5 minutes to complete and will occur on the same day.