Adolescence is a period in developing biological , psychological , sexual and social immediately following the child and that begins with puberty . Its range of duration varies according to different sources and medical opinions, scientific and psychological, but generally falls between the start 10 to 12 years, and its completion at 19 or 20.

For the World Health Organization , adolescence is the period between 10 and 19 and falls within the period of youth , between 10 and 24. The puberty or early adolescence is the first stage, usually begins at age 10 in girls and 11 for boys and goes up to 14-15 years. The middle and late adolescence extends to 19 years. A teenage youth remains full, from age 20 to 24 years.

Some psychologists believe that adolescence covers up to 21 years and some authors in recent studies have extended adolescence to age 25.

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Pregnancy or childbirth, is a term that includes human reproductive period of gestation. It begins when a man's sperm fertilizes the egg of the woman and this fertilized egg implants in the uterine wall.

The word adolescence comes from "suffers" which means "absence or lack of maturity," reason, pregnancy is not recommended at this stage of growth.

Adolescence is one of the most difficult step for us as human beings because it is a state of maturity where it seeks a maturity, in which we run the risk of failing or making mistakes that will sniff in our future life.

The teenage pregnancy is already a social, economic and public health of considerable magnitude, both for youth and their children, couples, family, environment and community around them. Some people call teen pregnancy as the "substitution of love for sex."

This problem has been improved by the introduction of issues of sexuality in schools, but not widespread at all educational institutions, for that reason I consider that the number of teenage pregnancies remains high falls.