Birth records from Swiss married couples analyzed over the past 35 years reveal an aging of first-time mothers by 5.1 years while the interpregnancy interval has shortened
Kalberer, U.; Baud, D.; Fontanet, A.; Hohlfeld, P.; de Ziegler, D.
Fertility and Sterility 92(6): 2072-2073
2009
ISSN/ISBN: 1556-5653 PMID: 19608170 DOI: 10.1016/j.fertnstert.2009.05.078Document Number: 206530
Although the general trend for delaying childbearing is generally viewed as causing infertility, its consequences on the interpregnancy interval have been unknown. A study of birth records for Swiss married women from 1969 to 2006 revealed that the woman's age at first birth has increased from 25.0 to 30.1 years, whereas calculated theoretical interpregnancy intervals after the first and second child decreased from 23.2 to 13 and from 22.4 to 7.9 months, respectively.
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