Objective: To analyze the sociocultural conditions, prenatal and obstetrical care, and data of the newborn, in pregnant young women residing in municipalities with very high and very low marginalization in Jalisco, Mexico, in 2014. Design: Quantitative, descriptive cross-sectional study. Institution: Jalisco Health Secretariat. Participants: Adolescents residents of both highly and very low marginalization municipalities. Methodology: Birth certificates of 140 adolescents residing in highly marginalized municipalities (Group 1) and 21 004 residing in municipalities with very low marginalization (Group 2) in Jalisco, Mexico, and who delivered a child during 2014, were reviewed. Main outcome measures: Univariate analysis of social and cultural conditions, prenatal and obstetrical care, data of the newborn. Results: From 28 178 births, 140 (0.5%) adolescents belonged to highly marginalized ...