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A well-known argument claims that socioeconomic differentials in children’s family structures have become increasingly important in shaping child outcomes and the resources available to children in developed societies. One assumption is that differentials are compara-tively small in Nordic welfare states. Our study examines how children’s experiences of family structures and family dynamics vary by their mother’s educational attainment in Finland. Based on register data on the childbearing and union histories of women in Finland born from 1969 onwards, we provide life-table estimates of children’s experiences of family dissolution, family formation and family structure from ages 0–15 years, stratified by mother’s education level at the child’s birth. We find huge socioeconomic disparities in children’s experiences of family structures and transitions. Compared to children of tertiary-educated mothers, those of basic-educated mothers are almost twice as likely to be born in cohabitation and four times as likely to be born to a lone mother; they are also much more likely to experience further changes in family structure–particularly parental separation. On average, children of low-educated mothers spend just half of their childhood years living with both their parents, whereas those of tertiary-educated mothers spend four-fifths of their childhood with both parents. The sociodemographic inequalities among children in Nordic welfare states clearly deserve more scholarly attention.