Background: Proper breastfeeding technique and an effective latch are essential for preventing breast engorgement in new mothers. In the first 14 days after delivery, Reverse Pressure Softening (RPS) has been proven to be a valuable intervention for alleviating breast engorgement. RPS involves applying gentle positive pressure to the areola near the nipple to reduce swelling and alleviate engorgement. This research's objective was estimating RPS effect on breast engorgement in postnatal women. Design: This research utilized a quasi-experimental approach. Setting: The study was executed in the postnatal ward of El-shatby Maternity University Hospital, with follow-up at participants' homes. Sample: A purposive sample of 80 postnatal women distributed equally between the control group (40 postnatal women), and the intervention group (40 postnatal women). Tools: Four different tools were employed for data collection: tool I Semi-structured Interview on General Characteristics of Postnatal Women. Tool II Visual Analog Scale (VAS) for pain assessment, tool III Six-point breast engorgement scale to measure engorgement severity and tool IV LATCH breastfeeding charting system to assess breastfeeding behaviors. Results: The study group (RPS intervention group) demonstrated a statistically significant improvement in comparison with the control group, as measured by the VAS and breast engorgement scale (p < 0.001). The study group also showed improved breastfeeding behaviors (p < 0.001). Conclusion: The RPS technique is an effective method for reducing breast engorgement and associated pain, particularly in primiparous (first-time) postnatal women. Additionally, it positively impacted newborn breastfeeding behavior. Recommendation: RPS should be promoted as a standard practice and incorporated into institutional policies as routine care for postnatal mothers experiencing breast engorgement.