Background: The number of interventions is lower, and the level of satisfaction is higher among women who receive midwife-led primary care from one or two midwives, compared to more midwives. This suggests that midwives in small-sized practices practice more women-centred. This has yet to be explored.Objective: To examine pregnant women’s perceptions, of the interpersonal action component of woman-centred care by primary care midwives, working in different sized practices.Methods: A cross-sectional study using the Client Centred Care Questionnaire (CCCQ), administered during the third trimester of pregnancy among Dutch women receiving midwife-led primary care from midwives organised in small-sized practices (1-2 midwives), medium-sized (3-4 midwives) and large-sized practices (≥5 midwives). A Welch ANOVA with post hoc Bonferroni correction was performed to examine the differences.Results: 553 completed questionnaires were received from 91 small-sized practices/104 women, 98 medium-sized practices/258 women and 65 large-sized practices/191 women. The overall sum scores varied between 57–72 on a minimum/maximum scoring range of 15-75. Women reported significantly higher woman-centred care scores of midwives in small-sized practices (score 70.7) compared with midwives in medium-sized practices (score 63.6) (p<.001) and large-sized practices (score 57.9) (p<.001), showing a large effect (d .88; d 1.56). Women reported statistically significant higher woman-centred care scores of midwives in medium-sized practices compared with large-sized practices (p<.001), showing a medium effect (d .69).Conclusion: There is a significant variance in woman-centred care based on women’s perceptions of woman-midwife interactions in primary care midwifery, with highest scores reported by womenreceiving care from a maximum of two midwives. Although the CCCQ scores of all practices are relatively high, the significant differences in favour of small-sized practices may contribute to moving woman centred care practice from ...