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. 2019 Jan 15;9(1):e026336. doi: 10.1136/bmjopen-2018-026336

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© Author(s) (or their employer(s)) 2019. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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(A) The total fertility rate and crude birth rate, from 1900 to 2017 in Finland. (B) The mean maternal age at birth and mean maternal age at first birth, from 1987 to 2016 in Finland. Note: below-replacement fertility: the total fertility rate lower than 2.1 children per women.