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 Urs Kalberer, M.D., David Baud, M.D., Ph.D., Arnaud Fontanet, M.D., Ph.D., Patrick Hohlfeld, M.D., Dominique de Ziegler, M.D. Fertility and Sterility Volume 92, Issue 6, Pages 2072-2073 (December 2009) DOI: 10.1016/j.fertnstert.2009.05.078 Copyright © 2009 American Society for Reproductive Medicine Terms and Conditions
Figure 1 (A) Maternal age at birth of first, second, and third child from 1969 to 2006. (B) Theoretical interpregnancy interval (IPI) after first and second child from 1969 to 2006. Fertility and Sterility 2009 92, 2072-2073DOI: (10.1016/j.fertnstert.2009.05.078) Copyright © 2009 American Society for Reproductive Medicine Terms and Conditions