This study aimed to describe the socioeconomic and psychosocial characteristics of a sample of teenage mothers classified according to marital status and age group. A sample of 1,228 adolescent mothers was interviewed in the immediate post-partum, selected from public and private hospitals in the City of Rio de Janeiro, Brazil. The chi-square test (chi2) was used to verify the hypothesis of homogeneity of proportions. Comparing the groups, we found that single and younger adolescents were at increased risk of unwanted pregnancy, less family support, and more abortions. Fathers of the infants also tended to be adolescents and unemployed. Adherence to prenatal care was influenced by the adolescent's marital status. The results showed that the most disadvantaged socioeconomic and psychosocial conditions were found among single and younger adolescents.