Abstract Background The influence of maternal health utilization on breastfeeding practices is well established. However, research shows that immigrant women tend to face challenges in accessing maternal health services. Our aim was to examine any variation in maternal and child health service utilization between immigrant and native-born mothers as well as to examine potential mediation roles of service utilization on the association between maternal origin and breastfeeding practices. Methods We used a nationwide FinChildren (2020) survey on parents with infants focusing on Somali (n = 29), Arabic (n = 81) and Russian speaking (n = 181) parents and their infants. We compared them with native Finnish speakers (n = 7508). We used Process Macro to conduct mediation analysis. Results Almost 25%/ of Somali-/Arabic-speaking mothers reported not taking their infants to routine child health clinic visits. The proportion was 0.4% for native-born mothers and 1.6% for Russian-speaking mothers (p < 0.001). Around 18% of Somali-/Arabic-speaking mothers and only 0.6% of the native-born mothers reported not utilizing child health clinic services in the past year (p < 0.001). Somali-/Arabic speaking mothers were more likely to receive breastfeeding support from maternity clinics and native-born mothers from maternity hospital or peer support groups. Russian-speaking mothers were most satisfied with the received child healthcare services while Somali/Arabic-speaking mothers were least satisfied with these services (p < 0.001). Only participating in breastfeeding peer support groups had mediation effects on association between maternal origin and breastfeeding practices. Conclusions This study shows that immigrants mothers, particularly Somali/Arabic speaking mothers use less the maternal health services particularly routine health visits. It is essential to encourage them to use the services to be able to monitor the health of both mother and the child. Key messages • Somali-/Arabic-speaking mothers are in a vulnerable position when it comes to utilizing healthcare services. • This study call for more research exploring factors contributing to this.