Efficacy, Safety and Limitations of Spinal Block for All Infants Under 3 Months

All patients will receive spinal anesthesia via midline approach with patients in sitting position established by assistant under complete aseptic conditions. A subcutaneous bleb using Lidocaine 1% through the needle of an insulin syringe followed by minor skin scratch to will help avoiding possible intrathecal dermoid implantation . A lumbar puncture will be performed in L4-L5 or L5- S1 interspace using 25-G 25-mm pencil-point spinal needle . Depth of epidural space is anticipated at 0.1 mm/kg . After getting free flow of cerebrospinal fluid (CSF) hyperbaric bupivacaine (0.5%) in a dose of 0.5 mg/kg (0.1 ml/kg) will be slowly injected in the subarachnoid space . The end of the injection will be taken as time zero for further data recording.