Background: Breastfeeding is the optimal method of infant feeding, particularly during the first 6 months after birth, and ideally continuing until the child is at least 2 years old. Speech--language therapists (SLTs) can improve the quality of care in this area, especially in vulnerable populations. Aims: This pilot study aimed to assess the feasibility, acceptability and effectiveness of speech--language therapy to support breastfeeding among migrant women in Portugal. It evaluates breastfeeding outcomes, maternal self-efficacy and quality of life post-intervention, and explores the role of SLTs in this context. Methods & Procedures: A total of 18 migrant women were recruited between September 2023 and September 2024. The speech--language therapy intervention included ante- and postnatal breastfeeding support, evaluated using pre- and post-workshop questionnaires assessing breastfeeding knowledge, attitudes, beliefs and practices. Postpartum follow-up was conducted at 1, 3 and 6 months, during which time the neonatal oral-motor assessment scale (NOMAS), breastfeeding self-efficacy scale (BSES) and maternal postpartum quality of life questionnaire (MPQLQ) were administered. Feasibility outcomes such as recruitment, retention, adherence and acceptability were also assessed, and semi-structured interviews were completed. Outcomes & Results: The findings indicated high feasibility, with strong recruitment and retention rates. Breastfeeding self-efficacy significantly improved, with scores rising from 55.6 (SD = 9.8) pre-intervention to 67.2 (SD = 8.3) at 6 months postpartum (t(15) = 5.89, p < 0.001). Maternal quality of life increased from 62.3 (SD = 5.2) at 1 month to 72.1 (SD = 4.6) at 6 months (t(15) = 6.23, p < 0.001). A 100% breastfeeding rate was achieved at 6 months postpartum. Qualitative data revealed that the participants valued comprehensive breastfeeding support and SLT involvement. Conclusions & Implications: This study demonstrated that speech--language therapy interventions are feasible and effective in improving breastfeeding outcomes among migrant women, warranting further investigation through larger trials.