Approximate outline of development periods in postnatal <a href="https://en.wikipedia.org/wiki/human_development_(biology)" class="extiw" title="en:human development (biology)">human development</a> until what generally is regarded as adulthood. 
<p>There are no universally unanimous definitions, so they vary considerably, but generally fall within the faded intervals at the flanks of the periods. Definitions included in this diagram are taken from the articles for each period, and references, when present, are also found there.
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For links to the periods in English Wikipedia, see <a href="//commons.wikimedia.org/wiki/File_talk:Child_development_stages.svg" title="File talk:Child development stages.svg">talk page</a> and <a href="https://en.wikipedia.org/wiki/Template:Humandevelopment" class="extiw" title="en:Template:Humandevelopment">en:Template:Humandevelopment</a>
<p><a href="https://en.wikipedia.org/wiki/User:Mikael_H%C3%A4ggstr%C3%B6m" class="extiw" title="en:User:Mikael Häggström">Mikael Häggström</a>.
</p><p>When using this image in external works, it may be cited as:
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<ul><li><cite style="font-style:normal">Häggström, Mikael (2014). "<a class="external text" href="https://en.wikiversity.org/wiki/WikiJournal_of_Medicine/Medical_gallery_of_Mikael_H%C3%A4ggstr%C3%B6m_2014">Medical gallery of Mikael Häggström 2014</a>". <i>WikiJournal of Medicine</i> <b>1</b> (2). <a href="https://en.wikipedia.org/wiki/Digital_object_identifier" class="extiw" title="w:Digital object identifier">DOI</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.15347/wjm/2014.008">10.15347/wjm/2014.008</a>. <a href="https://en.wikipedia.org/wiki/International_Standard_Serial_Number" class="extiw" title="en:International Standard Serial Number">ISSN</a> <a rel="nofollow" class="external text" href="https://www.worldcat.org/issn/2002-4436">2002-4436</a>.</cite> <a rel="nofollow" class="external text" href="https://creativecommons.org/publicdomain/zero/1.0/deed.en">Public Domain</a>.</li></ul><p>or
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<ul><li><i>By Mikael Häggström, used with permission.</i></li></ul>
<span class="int-own-work" lang="en">Own work</span>