The rise in non-marital childbearing has coincided with educational expansion, although

non- marital childbirths are more common among the low-educated population. This

article examines how changes in the education-specific rates of non-marital

childbearing and in the educational distribution of parents contributed to increased nonmarital

childbearing among Finnish first-time parents over the 1970–2009 period. Using

register data and a decomposition approach, we find that the increase in non-marital

first-time births was driven mainly by the large population of secondary-educated

women and men and by the growing group of lower tertiary-educated women. The

lowest-educated population continued to have the highest proportion of non-marital

first-time childbearing, but their overall contribution was small due to diminishing

group size. The highest-educated population increased its contribution to non-marital

childbearing but still has the lowest non-marital childbearing rates. We conclude that

the medium-educated population makes important contributions to family changes and

merits increased scholarly attention.