Inclusion Criteria:  Patients postpartum vaginal conventional analgesia management of your labor ASA II Do not include patients with history of allergy to morphine. Patients who agreed to be included in the study but did not sign informed consent.  Exclusion Criteria:  Submit a complication that makes it difficult postoperative pain assessment or adverse effects after surgery. Patients who, after having been included, express their desire to be excluded. Patients with incomplete follow-up.id Did not include patients who have absolute contraindications for epidural anesthesia, or could not provide informed consent, as in the following cases: local infection at the site of administration, systemic infection, bleeding disorders, disease of the spine , mental patients, drug history, sleep apnea, history of headache post-puncture headache or frequent any kind.