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Young maternal age and infant mortality: the role of low birth weight
Insights
Teenage mothers face higher infant mortality risks, especially for newborns with low birth weight. While preventing low birth weight can reduce neonatal deaths, postneonatal mortality in teen births may require better parenting support.
Area of Science:
- Public Health
- Epidemiology
- Sociology
Background:
- Infant mortality is a significant public health concern.
- Teenage mothers (19 years or younger) have historically faced higher risks for infant mortality.
- Low birth weight (less than 2,500 grams) is a primary risk factor associated with teenage pregnancies.
Purpose of the Study:
- To examine the impact of young maternal age and low birth weight on infant mortality.
- To analyze the effects on neonatal and postneonatal mortality rates.
- To investigate these effects across different racial groups and maternal age categories.
Main Methods:
- Utilized data from the National Infant Mortality Surveillance (NIMS) project for infants born in 1980.
- Included 2,527,813 births (black or white, mothers aged 10-29) from 48 states and D.C.
- Employed direct standardization to calculate relative risks, adjusting for birth weight, race, and maternal age.
Main Results:
- A strong correlation exists between young maternal age and increased infant mortality and low birth weight.
- Neonatal mortality decreased with increasing maternal age.
- After adjusting for birth weight, babies born to mothers under 16 still showed 11-40% higher mortality risk compared to those born to mothers aged 25-29.
Conclusions:
- Preventing low birth weight is crucial for reducing neonatal mortality among babies born to teenagers.
- Postneonatal mortality reduction may require additional interventions, such as improved parenting support for young mothers.
- Teenage childbearing poses social disadvantages for both mother and infant, irrespective of biological factors.
Abstract:
In 1980, there were 562,330 babies born in the United States to teenage mothers (19 years of age or younger). The offspring of teenage mothers have long been known to be at increased risk of infant mortality, largely because of their high prevalence of low birth weight (less than 2,500 grams). We used data from the National Infant Mortality Surveillance (NIMS) project to examine the effect of young maternal age and low birth weight on infant mortality among infants born in 1980 to U.S. residents. This analysis was restricted to single-delivery babies who were either black or white, who were born to mothers ages 10-29 years, and who were born in one of 48 States or the District of Columbia. Included were 2,527,813 births and 28,499 deaths (data from Maine and Texas were excluded for technical reasons). Direct standardization was used to calculate the relative risks, adjusted for birth weight, of neonatal mortality (less than 28 days of life) and postneonatal mortality (28 days to less than 1 year of life) by race and maternal age. There was a strong association between young maternal age and high infant mortality and between young maternal age and a high prevalence of low birth weight. Neonatal mortality declined steadily with increasing maternal age. After adjusting for birth weight, the race-specific relative risks for babies born to mothers less than 16 years of age were still elevated from 11 to 40 percent, compared with babies born to mothers 25-29 years of age. Otherwise, all the relative risks were nearly equal to 1. By contrast, most of the association between young maternal age and postneonatal mortality persisted after birth weight adjustment in all maternal age groups.These results suggest that the prevention of neonatal mortality and, to a lesser extent, postneonatal mortality among babies born to teenagers depends on preventing low birth weight. The prevention of postneonatal mortality may depend more on other factors, such as assisting teenagers with better parenting. Finally, although there maybe few biological reasons to postpone childbearing,teenage childbearing continues to place the mother and her baby at a social disadvantage.