Add-on Effectiveness of EA or TENS in Early Postpartum Breast Engorgement

Participants will receive once a day, three consecutive days of interventions in each group, including identical routine care. On each visit, severity index (SI) subject to the extent of erythema, tension and pain over breast will be assessed. Questionnaires of Breastfeeding Self-Efficacy Scale (BSES-SF) and of Edinburgh postnatal depression scale (EPDS) will be performed. Heart-rate variability was evaluated and recorded via a real-time handheld HRV device. Oxycontin, Cortisol, sodium and potassium levels in breastmilk will be tested . A telephone follow-up will be performed in 30 days after completion of treatment, and the data will be collected and analyzed.