Sexually transmitted diseases, unwanted pregnancy, underage alcohol abuse, social and sexual abuse cases are a global public-health problems, and work on their prevention is a fundamental prerequisite of preserving reproductive health in mature age. Juvenile pregnancy are not only a medical problem, but a problem of sexual education of young people and the public health system. Are associated with insufficient knowledge about birth control, easy availability of alcohol to minors, upuštanjem in a variety of adventures that leave a trace on the juvenile's parents, as well as on children. Sexually responsible behavior is one of the most important determinants of sexual health. Under the sexually responsible behavior we mean knowingly and responsibly in sexual relations, the use of protection when sexual relations in order to prevent unwanted pregnancy, and sexually transmitted diseases. With regard to the availability of birth control, the number of young people who continue to engage in risky sexual behavior is still great. The average age in Croatia in which the young shall enter into sexual relations with a boy is 16 years, and 17 years of age in girls. Doctors mostly juvenile pregnancy are considered risky pregnancies. The reason for this is that physically and psychologically growth of the girl has not yet been completed, so it is and an increased risk of miscarriage, preterm delivery and the risk of falling behind in the development of the fetus. Underage pregnant women usually are not regularly controlled, and so are more likely to have STDs. Uterus in girls is still not mature enough, so he and greater susceptibility to infection. You can reach the muscle and skeletal deformities such as underdeveloped pelvis. Family Centers except for psychological help to offer legal advice. Most of the young pregnant woman still in the process of schooling, it is very important to allow the girl to continue schooling up to the moment when the pregnancy becomes an obstacle to class trips. Centers for social care offering financial assistance, and help with accommodation outside their own families if necessary, and student homes is referenced by the girls to the gynecologist and adapted to the continuation of the stay in the home. The paper more closely explained by adolescent pregnancy, the benefits of family planning, the importance of breastfeeding and breast milk expression, and I the course of childbirth or interruption of pregnancy at this age.