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Updated: Dec 22, 2025
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Author Spotlight: Exploring the Long-Term Health Impacts of Intracytoplasmic Sperm Injection on Offspring
Published on: May 17, 2024
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Summary
Delayed conception births, termed overdue births, represented 12% of total births in 1973-75 and increased over time. This trend was more pronounced in women over 25, with older mothers experiencing longer delays.
Area of Science:
- Reproductive Health
- Demography
- Sociology
Background:
- Delayed conception, or overdue births, is a growing concern in reproductive health.
- Understanding the trends and factors associated with overdue births is crucial for family planning and public health initiatives.
Purpose of the Study:
- To analyze the incidence and trends of overdue births using data from the National Survey of Family Growth.
- To identify demographic factors associated with pregnancies that began later than desired.
Main Methods:
- Utilized data from the National Survey of Family Growth, Cycles I and II.
- Described the level and trend in the incidence of overdue births.
- Analyzed waiting times to conception among women who scheduled intercourse during their fertile period.
Main Results:
- Overdue births constituted approximately 12% of total births between 1973-75, with an upward trend observed.
- The incidence of overdue births increased, particularly among mothers over 25 years of age.
- Pregnancies 12 months or more overdue were more prevalent in mothers over 30 compared to younger mothers.
Conclusions:
- A potential decline in fecundity after age 30 may contribute to overdue births.
- Age is a significant factor influencing the timing of conception and the occurrence of overdue births.
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