Objective
The adolescent pregnancy is one of the most important problems in the 21st century. The adolescent pregnancies pose more health risks to both mothers and babies when compared with the adult pregnancies. Of all the births in the world, 11% are given by the adolescents. The aim of the study was to determine the sociodemographic factors concerning with the adolescent pregnancy.

Methods
This study was conducted at 18 primary health care centers in Mersin, Turkey. The adolescent group was comprised of pregnant women younger than 19 years, the adult group was comprised of pregnants aged between 20–29 years. The questionnaire was conducted with face-to-face interviews.

Results
Respondents included 107 pregnant adolescents and 110 pregnant adults. The median age of adolescent group and adult group was 18 and 26 years, respectively. About 61.7% of the pregnant adolescents and 94.5% of the pregnant adults were officially married. In the adolescent group, the family frequency without social security was more than that in the adult group. In the adult group, the frequency of opposing the adolescent pregnancy for their families was more than that in the adolescent group. The adolescent pregnancy among sisters and friends of the adolescent pregnants was more frequent compared with that in the adult group.

Conclusions
The family frequency without social security was more in the adolescent group. This situation is certain to cause more problems for the adolescents in benefiting from the health care services. We are absolutely think that efforts should be made so as to improve the society in terms of social and cultural aspects.