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</ iframe > </noscript> <!-- End Google Tag Manager (noscript) --><div id="header"> <div id="CClogo"><a href="https://www.cookchildrens.org"><span class="srText">Cook Children's</span></a></div> <div id="CCsearch"> <form id="searchform" name="searchform" method="GET" onsubmit="return (this.q.value == '') ? false : true;" action="/CookChildrens/en/parents/"> <input type="hidden" name="search" value="y"/> <input type="hidden" name="getfields" value="description"/> <input type="search" class="search" name="q" id="q" maxlength="256" autocomplete="off" autocorrect="off" placeholder="Search"/> <input type="hidden" name="datasource" value="cookchildrens"> <input type="hidden" name="start" value="0"> <input type="hidden" name="rows" value="10"> <input type="hidden" name="lang" value="english"> <input type="hidden" name="section" value="parents_teens_kids"> <input type="submit" value="" id="searchButton" class="buttonImage"/> </form> </div> </div> <!-- If we have main navigation separated then it will reside here --> <div id="thelou" tabindex="-1"> </div> <div id="mainContentContainer" class="kh-article-page"> <div id="rsSearchBrowse"> <div id="rsBrowse" role="navigation"> </div> <div id="rsSearch"> <div id="rsSectionLabel">parents</div> </div> </div> <div id="khContentHeading" class="ar licH"> <h1>A to Z: Trisomy 21</h1> </div> <div id="khcontent"> <div id="khcontent_article" style=""><!--googleoff:all--> <div id="languagePairLink" class="rs_skip"><a href="/CookChildrens/es/parents/az-trisomy.html"><span class="pairedURLHead" lang="es">en español<img src="/images/n00/icons/langPairArrow.svg" alt=""></span><span class="pairedURLBody" lang="es">A-Z: Trisomía del par 21</span></a></div> <!--googleon:all--><!--googleon:all--><div class="rte-image"><!--<sly data-sly-test.buttonBorder="khb-noborder"></sly> --><p>See: <a href="/CookChildrens/en/parents/az-down.html">Down Syndrome</a>.</p></div><!--googleoff:all--></div> </div> <div id="kh_lic_footer"> <nav aria-label="Content info"> <ul id="kh_lic_footer_links"> <li><a href="/CookChildrens/en/parents/editorial-policy-licensee.html">Editorial Policy</a></li> <li><a href="/CookChildrens/en/parents/policy-licensees.html">KidsHealth Privacy Policy & Terms of Use</a></li> <li><a href="/CookChildrens/en/parents/copyright.html">Copyright</a></li> </ul> </nav> <div id="kh_lic_footer_legalease"> <p><img lang="en" alt="A KidsHealth Education Partner" src="/images/n00/logos/eduPartner3.svg"> Note: All information is for educational purposes only. For specific medical advice, diagnoses, and treatment, consult your doctor. </p> <p>© 1995-<script>document.write(KHcopyDate);</script> The Nemours Foundation. KidsHealth® is a registered trademark of The Nemours Foundation. All rights reserved.</p> <div class="imageDisclaimer"> <p> Images sourced by The Nemours Foundation and Getty Images. </p> </div> </div> </div> </div> <div id="footer"> <p><a href="http://www.cookchildrens.org"><span class="srText">Cook Children's</span></a></p> <p>Copyright <script type="text/javascript" language="JavaScript"> document.write(KHcopyDate) </script> by <nobr>Cook Children's Health Care System</nobr>, <nobr>Fort Worth, Texas</nobr></p> </div> <script src="/misc/javascript/n00/nitro-main.js"></script><script src="/misc/javascript/n00/n00_art.js"></script><script src="/misc/javascript/kh_footJS_common.js"> </script><script src="/misc/javascript/kh_footJS_desktop.js"> </script><script> var kidsHealthSearchHandler = "/CookChildrens/en/parents/"; // KidsHealth custom search handler var kidsHealthLicID = "403"; </script><script> function downloadJSAtOnload(deferredScriptPath) { var element = document.createElement('script'); element.src = deferredScriptPath; document.body.appendChild(element); } if (window.addEventListener) { window.addEventListener('load', downloadJSAtOnload('/misc/javascript/kh_deferredJS.js'), false); } else if (window.attachEvent) { window.attachEvent('onload', downloadJSAtOnload('/misc/javascript/kh_deferredJS.js'), false); } else { window.onload = downloadJSAtOnload('/misc/javascript/kh_deferredJS.js'); } </script><script> textSizer('1'); </script><div id="ariaAnnouncements" aria-live="polite" tabindex="-1" style="visibility: hidden; width: 1px; height: 1px;"> </div> <!--googleon:all--></body></html>