The average age of menarche (first menstrual period) in the United States is 12.5 years old, though this figure varies by ethnicity and weight, and first ovulation occurs only irregularly until after this. The average age of menarche has been declining and is continuing to do so. Whether fertility leads to early pregnancy depends on a number of factors, both societal and personal. Worldwide, rates of teenage pregnancy range from 143 per 1000 in some sub-Saharan African countries to 2.9 per 1000 in South Korea.
Pregnant teenagers face many of the same obstetrics issues as women in their 20s and 30s. However, there are additional medical concerns for younger mothers, particularly those under 15 and those living in developing countries. For mothers between 15 and 19, age in itself is not a risk factor, but additional risks may be associated with socioeconomic factors.
Data supporting teenage pregnancy as a social issue in developed countries include lower educational levels, higher rates of poverty, and other poorer "life outcomes" in children of teenage mothers. Teenage pregnancy in developed countries is usually outside of marriage, and carries a social stigma in many communities and cultures. For these reasons, there have been many studies and campaigns which attempt to uncover the causes and limit the numbers of teenage pregnancies. In other countries and cultures, particularly in the developing world, teenage pregnancy is usually within marriage and does not involve a social stigma.
| Country | Teenage birth rate per 1000 women 15-19 |
|---|---|
| South Korea | 3 |
| Netherlands | 5 |
| Tunisia | 7 |
| Australia | 16 |
| United Kingdom | 20 |
| Russia | 30 |
| United States | 53 |
| Indonesia | 55 |
| South Africa | 66 |
| Brazil | 73 |
| Bangladesh | 117 |
| Niger | 233 |
A report by Save the Children found that, annually, 13 million children are born to women under age 20 worldwide, more than 90% in developing countries. Complications of pregnancy and childbirth are the leading cause of mortality among women between the ages of 15 and 19 in such areas. The highest rate of teenage pregnancy in the world is in sub-Saharan Africa, where women tend to marry at an early age. In Niger, for example, 87% of women surveyed were married and 53% had given birth to a child before the age of 18.
In the Indian subcontinent, early marriage sometimes means adolescent pregnancy, particularly in rural regions where the rate is much higher than it is in urbanized areas. The rate of early marriage and pregnancy has decreased sharply in Indonesia and Malaysia, although it remains relatively high. In the industrialized Asian nations such as South Korea and Singapore, teenage birth rates are among the lowest in the world.
The overall trend in Europe since 1970 has been a decreasing total fertility rate, an increase in the age at which women experience their first birth, and a decrease in the number of births among teenagers. Most continental Western European countries have very low teenage birth rates. This is varyingly attributed to good sex education and high levels of contraceptive use (in the case of the Netherlands and Scandinavia), traditional values and social stigmatization (in the case of Italy and Spain) or both (in the case of Switzerland).
The teenage birth rate in the United States is the highest in the developed world, and the teenage abortion rate is also high. The U.S. teenage pregnancy rate was at a high in the 1950s and has decreased since then, although there has been an increase in births out of wedlock. The teenage pregnancy rate decreased significantly in the 1990s; this decline manifested across all racial groups, although teenagers of African-American and Hispanic descent retain a higher rate, in comparison to that of European-Americans and Asian-Americans. The Guttmacher Institute attributed about 25% of the decline to abstinence and 75% to the effective use of contraceptives.
However, as of 2006 the teenage birth rate began to rise once again for the first time in fourteen years. This could imply that teen pregnancy rates are also on the rise, however the rise could also be due to other sources: a possible decrease in the number of abortions or a decrease in the number of miscarraiges, to name a few.The Canadian teenage birth has also trended towards a steady decline for both younger (15-17) and older (18-19) teens in the period between 1992-2002.
In societies where adolescent marriage is uncommon, young age at first intercourse and lack of contraceptive use may be factors in teen pregnancy. Most teenage pregnancies in the developed world appear to be unplanned.
However, in a Kaiser Family Foundation study of US teenagers, 29% of teens reported feeling pressure to have sex, 33% of sexually active teens reported "being in a relationship where they felt things were moving too fast sexually", and 24% had "done something sexual they didn’t really want to do". Several polls have indicated peer pressure as a factor in encouraging both girls and boys to have sex. Inhibition-reducing drugs and alcohol may encourage unintended sexual activity.
Adolescents may lack knowledge of, or access to, conventional methods of preventing pregnancy, as they may be too embarrassed or frightened to seek such information.
In the United States, according to the 2002 National Surveys of Family Growth, in 2002, sexually active adolescent women wishing to avoid pregnancy were less likely than those of other ages to use contraceptives (18% of 15- to 19-year-olds used no contraceptives, versus 10.7% average for women ages 15 to 44). Over half of unintended pregnancies were to women not using contraceptives. 23% of sexually active young women in a 1996 Seventeen magazine poll admitted to having had unprotected sex with a partner who did not use a condom, while 70% of girls in a 1997 PARADE poll claimed it was embarrassing to buy birth control or request information from a doctor.
Among teens in the UK seeking an abortion, a study found that the rate of contraceptive use was roughly the same for teens as for older women.
In other cases, contraception is used, but proves to be inadequate. Inexperienced adolescents may use condoms incorrectly or forget to take oral contraceptives. Contraceptive failure rates are higher for teenagers, particularly poor ones, than for older users. Longer term methods such as intrauterine devices, subcutaneous implants, or injections (Depo provera, Combined injectable contraceptive), require less frequent user action, lasting from a month to years, and may prevent pregnancy more effectively in women who have trouble following routines, including many young women. The use of more than one contraceptive measure decreases the risk of unplanned pregnancy, and if one is a condom barrier method, the transmission of sexually transmitted disease is also reduced.
Multiple studies have indicated a strong link between early childhood sexual abuse and subsequent teenage pregnancy in industrialized countries. Up to 70 percent of women who gave birth in their teens were molested as young girls; by contrast, 25 percent for women who did not give birth as teens were molested.
In many countries, sexual intercourse between a minor and an adult is not considered consensual under the law because a minor is believed to lack the maturity and competence to make an informed decision to engage in fully consensual sex with an adult. Sex with a minor in developed countries is considered statutory rape, although what constitutes statutory rape differs by jurisdiction. In the United States, for example, it is illegal in many states for an adult to have sex with anyone under 18. In the United Kingdom and the Netherlands, it is illegal for a man to have sex with a girl under 16; in Italy under 14, and in Spain under 12 (see age of consent).
In a study of 379 pregnant or parenting teens and 95 teenage girls without children, 62% of the girls aged 11-15 years and 56% of girls aged 16-19 years reported experiencing domestic violence at the hands of their partners. Moreover, 51% of the girls reported experiencing at least one instance where their boyfriend attempted to sabotage their efforts to use birth control.
Poverty is associated with increased rates of teenage pregnancy. Economically poor countries such as Niger and Bangladesh have far more teenage mothers compared with economically rich countries such as Switzerland and Japan.
In the UK, around half of all pregnancies to under 18s are concentrated among the 30% most deprived population, with only 14% occurring among the 30% least deprived. In Italy, the teenage birth rate in the well-off central regions is only 3.3 per 1,000, while in the poorer Mezzogiorno it is 10.0 per 1000. Sociologist Mike A. Males noted that teenage birth rates closely mapped poverty rates in California:
| County | Poverty rate | Birth rate* |
|---|---|---|
| Marin County | 5% | 5 |
| Tulare County (Caucasians) | 18% | 50 |
| Tulare County (Hispanics) | 40% | 100 |
There is little evidence to support the common belief that teenage mothers become pregnant to get benefits, welfare, and council housing. Most knew little about housing or financial aid before they got pregnant and what they thought they knew often turned out to be wrong.
Studies have also found that girls whose fathers left the family early in their lives had the highest rates of early sexual activity and adolescent pregnancy. Girls whose fathers left them at a later age had a lower rate of early sexual activity, and the lowest rates are found in girls whose fathers were present throughout their childhood. Even when the researchers took into account other factors that could have contributed to early sexual activity and pregnancy, such as behavioral problems and life adversity, early father-absent girls were still about five times more likely in the United States and three times more likely in New Zealand to become pregnant as adolescents than were father-present girls.
Low educational expectations have been pinpointed as a risk factor. A girl is also more likely to become a teenage parent if her mother or older sister gave birth in her teens.A majority of respondents in a 1988 Joint Center for Political and Economic Studies survey attributed the occurrence of adolescent pregnancy to a breakdown of communication between parents and child and also to inadequate parental supervision.
Foster care youth are more likely than their peers to become pregnant as teenagers. The National Casey Alumni Study, which surveyed foster care alumni from 23 communities across the United States, found the birth rate for girls in foster care was more than double the rate of their peers outside the foster care system. A University of Chicago study of youth transitioning out of foster care in Illinois, Iowa, and Wisconsin found that nearly half of the females had been pregnant by age 19. The Utah Department of Human Services found that girls who had left the foster care system between 1999 and 2004 had a birth rate nearly 3 times the rate for girls in the general population.
In the UK, the teenage pregnancy strategy, which was run first by the Department of Health and is now based out of the Children, Young People and Families directorate in the Department for Education and Skills, works on several levels to reduce teenage pregnancy and increase the social inclusion of teenage mothers and their families by:
The teenage pregnancy strategy has had mixed success. Although teenage pregnancies have fallen overall, they have not fallen consistently in every region, and in some areas they have increased. There are questions about whether the 2010 target of a 50% reduction on 1998 levels can be met.
In the United States the topic of sex education is the subject of much contentious debate. Some schools provide "abstinence-only" education and virginity pledges are increasingly popular. Most public schools offer "abstinence-plus" programs that support abstinence but also offer advice about contraception. A team of researchers and educators in California have published a list of "best practices" in the prevention of teen pregnancy, which includes, in addition to the previously mentioned concepts, working to "instill a belief in a successful future", male involvement in the prevention process, and designing interventions that are culturally relevant.
The Dutch approach to preventing teenage pregnancy has often been seen as a model by other countries. The curriculum focuses on values, attitudes, communication and negotiation skills, as well as biological aspects of reproduction. The media has encouraged open dialogue and the health-care system guarantees confidentiality and a non-judgmental approach.
In the developing world, programs of reproductive health aimed at teenagers are often small scale and not centrally coordinated, although some countries such as Indonesia and Sri Lanka have a systematic policy framework for teaching about sex within schools. Non-governmental agencies such as the International Planned Parenthood Federation provide contraceptive advice for young women worldwide. Laws against child marriage have reduced but not eliminated the practice. Improved female literacy and educational prospects have led to an increase in the age at first birth in areas such as Iran, Indonesia, and the Indian state of Kerala.
Inadequate nutrition during pregnancy is an even more marked problem among teenagers in developing countries. Complications of pregnancy result in the deaths of an estimated 70,000 teen girls in developing countries each year. Young mothers and their babies are also at greater risk of contracting HIV. The World Health Organization estimates that the risk of death following pregnancy is twice as great for women between 15 and 19 years than for those between the ages of 20 and 24. The maternal mortality rate can be up to five times higher for girls aged between 10 and 14 than for women of about twenty years of age. Illegal abortion also holds many risks for teenage girls in areas such as sub-Saharan Africa.
Risks for medical complications are greater for girls 14 years of age and younger, as an underdeveloped pelvis can lead to difficulties in childbirth. Obstructed labour is normally dealt with by Caesarean section in industrialized nations; however, in developing regions where medical services might be unavailable, it can lead to eclampsia, obstetric fistula, infant mortality, or maternal death. For mothers in their late teens, age in itself is not a risk factor, and poor outcomes are associated more with socioeconomic factors rather than with biology.
Young motherhood in an industrialized country can affect employment and social class. Less than one third of teenage mothers receive any form of child support, vastly increasing the likelihood of turning to the government for assistance.The correlation between earlier childbearing and failure to complete high school reduces career opportunities for many young women. One study found that, in 1988, 60% of teenage mothers were impoverished at the time of giving birth. Additional research found that nearly 50% of all adolescent mothers sought social assistance within the first five years of their child's life. A study of 100 teenaged mothers in the United Kingdom found that only 11% received a salary while the remaining 89% were unemployed. Most British teenage mothers live in poverty, with nearly half in the bottom fifth of the income distribution. Teenage mothers are seven times more likely to commit suicide than other teenagers. 
One-fourth of adolescent mothers will have a second child within 24 months of the first. Factors that determine which mothers are more likely to have a closely-spaced repeat birth include marriage and education: the likelihood decreases with the level of education of the young woman – or her parents – and increases if she gets married.
Poor academic performance in the children of teenage mothers has also been noted, with many of them being more likely than average to fail to graduate from secondary school, be held back a grade level, or score lower on standardized tests. Daughters born to adolescent parents are more likely to become teen mothers themselves. A son born to a young woman in her teens is three times more likely to be gay in prison.
In other countries, such as the United States and the Republic of Ireland, the majority of teenage mothers are not married to the fathers of their children. In the UK, half of all teenagers with children are lone parents, 40% are cohabitating as a couple and 10% are married. Teenage parents are frequently in a romantic relationship at the time of birth, but many adolescent fathers do not stay with the mother and this often disrupts their relationship with the child. Research has shown that when teenage fathers are included in decision-making during pregnancy and birth, they are more likely to report increased involvement with their children in later years. In the U.S, eight out of ten teenage fathers do not marry their child's mother.
However, "teenage father" may be a misnomer in many cases. Studies by the Population Reference Bureau and the National Center for Health Statistics found that about two-thirds of births to teenage girls in the United States are fathered by adult men age 20 or older. The Guttmacher Institute reports that over 40 percent of mothers aged 15-17 had sexual partners three to five years older and almost one in five had partners six or more years older. A 1990 study of births to California teens reported that the younger the mother, the greater the age gap with her male partner. In the UK 72% of jointly registered births to women under the age of 20, the father is over the age of 20, with almost 1 in 4 being over 25.
The pregnancy itself may be the result of sexual abuse (Rose in The Cider House Rules), a one-night stand (Amy Barnes in Hollyoaks) or a romantic relationship (Demi Miller in EastEnders); unusually, in Quinceañera, the central character becomes pregnant through non-penetrative sex. The drama often focuses around the discovery of the pregnancy and the decision to opt for abortion (Fast Times at Ridgemont High), adoption (Mom at Sixteen, Juno), marriage (Reba and Jeni, Juno) or life as a single mother (Someone Like You). In the German play Spring Awakening (and the Broadway musical based upon it), the central female character gets pregnant and dies from a botched abortion. Stephanie Daley deals with the aftermath of a teenage pregnancy that ends with a dead newborn baby. While the pregnant girl herself is normally the chief protagonist, Too Young to Be a Dad centers on a 15-year-old boy whose girlfriend becomes pregnant, while The Snapper focuses on the reactions of the family, particularly the soon-to-be grandfather. In the 2007 Oscar winning film Juno, a young teenage girl deals with being pregnant.
Other fiction, particularly in a long-running television series, looks at the long-term effects of becoming a parent at a very young age (Degrassi Junior High). In Gilmore Girls, because Lorelai Gilmore is only 16 years older than her daughter Rory, the two are more like sisters than parent and child. Looking for Alibrandi also features the teenage daughter of a woman who was herself a teenage mother. In The George Lopez Show, Benny Lopez, George's Mother gave birth to George at 16. In a new television show, The Secret Life of the American Teenager, the main character, Amy, subsequently gets pregnant after having sex with another character, Ricky, at band camp during the summer.
Songs about teenage pregnancy include downbeat tales of abuse ("Brenda's Got a Baby"), poverty ("In The Ghetto") and back-alley abortion ("Sally's Pigeons"), as well as upbeat and defiant tunes such as "Papa Don't Preach". American pop singer Fantasia Barrino, who was 17 when she gave birth to her daughter, released a controversial song about single motherhood entitled "Baby Mama", describing the difficulty of raising a child alone with limited financial and family support. (Many U.S. radio stations would not play the song, ostensibly because it contains a profanity.) "There Goes My Life", a modern country song, focuses on the reaction of the father, who rhetorically asks, "I'm just a kid myself; how am I going to raise one?" As the daughter grows up, his attitude changes, and the song ends with his tearful farewell as she leaves for college. Due to its implied pro-life message, "There Goes My Life" was sung at the inauguration of George W. Bush in 2005 .
Autobiographies that look at the author’s own experience of teenage motherhood include I Know Why the Caged Bird Sings and Gather Together in My Name by Maya Angelou, Coal Miner's Daughter by Loretta Lynn, and Riding in Cars with Boys by Beverly D'Onofrio.
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