Purpose: Little is known about the substance use patterns of adolescen
t mothers, particularly in the postpartum period. This study provides
descriptive, longitudinal data on the substance use behavior of a coho
rt of adolescent mothers. Methods: A total of 241 pregnant adolescents
, under 18 years old and planning to carry the pregnancy to term, comp
leted the initial interview. Respondents were interviewed again at 1,
6, 12, and 18 months postpartum. The data reported here are based on t
he 229 respondents who completed all five interviews. Results: Use of
all substances decreased substantially during pregnancy, but increased
steadily in the first 6 months postpartum. A similar pattern was obse
rved for regular use of multiple substances. Regular use before and af
ter the pregnancy, but not during it, was the most common pattern of s
ubstance use. Conclusions: The prevalence of substance use among adole
scent mothers is significant. To capitalize on the large decreases in
use during pregnancy, drug prevention programs for adolescent mothers
should target the first 6 months postpartum.