Effect of Small Versus Large Epidural Needles on Postdural Puncture Headache Study

Inclusion Criteria: * American Society of Anesthesiologists status 1 to 2 * Must have provided written informed consent = or \< 6cm cervical dilation * Fetus 37 to 42 weeks gestation * Must be able to read and write English well enough to provide written informed consent Exclusion Criteria: * BMI = or \> 40 * Multiple gestation pregnancy * Known contraindications to use of epidural analgesia * Pregnancy-induced hypertension * Investigator concern for maternal or neonatal welfare * Receipt of spinal or epidural anesthesia within 14 days of labour epidural request * Women with chronic headaches (defined as headaches that occur 15 or more days per month for more than 3 months) * Already participated in study * History of narcotic abuse