Week 16enparentshttps://kidshealth.org/EN/images/headers/P_PregCal_Wk16_enHD.jpgYour baby can hold his or her head erect, and facial muscles now allow for a variety of expressions, such as squinting and frowning.pregnancy, pregnancy calendar, developing baby, developing fetus03/09/200102/03/202002/03/20202c5eac61-4b01-43d7-b750-d1bc540519cchttps://kidshealth.org/ws/RadyChildrens/en/parents/week16.html/<h3>Your Baby's Development</h3> <p><span style="font-size: 1em;">Your baby now weighs about 3.9 ounces (110 grams) and measures about <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/babyslideshow.html/"><img class="right" title="Watch Your Baby Grow" src="https://kidshealth.org/EN/images/promos/PregCal-BabyGrow-enPR.jpg" alt="Watch Your Baby Grow" /></a>4.7 inches (12 cm) in length from crown to rump. Your baby can hold his or her head erect, and the development of facial muscles allows for a variety of expressions, such as squinting and frowning.<br /></span></p> <p><img title="Week 16" src="https://kidshealth.org/EN/images/galleries/PregCal-Week16-enGL.jpg" alt="Week 16" /></p> <h3>Your Body</h3> <p><a href="https://kidshealth.org/ws/RadyChildrens/en/parents/momandbaby-slideshow.html/"><img class="right" title="" src="https://kidshealth.org/EN/images/buttons/PregnancySlideshow-Belly-enBT-1.png" alt="Watch your belly grow!" /></a>Between weeks 16 and 18 of pregnancy, your health care provider may offer you a second trimester <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/prenatal-multiple-marker.html/">screening test</a> (known as the&nbsp;multiple marker test or&nbsp;triple screen). This test measures the levels of alpha-fetoprotein (AFP), a protein produced by the fetus, and the pregnancy hormones hCG and estriol in the mother's blood. It's called a quadruple screen (or quad screen) when the level of an additional substance, called inhibin-A, is also measured.</p> <p>If you have already done a blood test and/or ultrasound in the first trimester (first trimester screening test), then the results of the two tests together is called an integrated screening test. The results of these tests can tell moms whether their babies are <strong>at risk for</strong> (not whether they have) neural tube defects such as <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/spina-bifida.html/">spina bifida</a> or chromosomal abnormalities such as <a href="https://kidshealth.org/ws/RadyChildrens/en/parents/down-syndrome.html/">Down syndrome</a>.</p> <p>An abnormal result does not necessarily mean that your baby has a problem &mdash; but it may mean more testing is required. Talk to your health care provider about the risks and advantages of these tests.</p> <p> <script src="//familysurvey.org/misc/javascript/js_apps/pregnancy-calendar/kh-pregnancy-calendar-final.js" type="text/javascript"></script> </p> <div class="kh-pregnancy-calendar"> <div class="kh-pregnancy-calendar-topbar">PREGNANCY CALENDAR: <strong>A week-by-week guide</strong></div> <div class="kh-pregnancy-calendar-inner-container"> <div class="kh-pregnancy-calendar-topnav"><!-- ensure that the week value for Previous is 1 less than khPregnancyDay and that next is 1 more e.g. for week 3, Previous will be week 2 and Next will be week 4 --> <div class="kh-pregnancy-calendar-prev-active"><a href="https://kidshealth.org/ws/RadyChildrens/en/parents/week15.html/">Previous</a></div> <div class="kh-pregnancy-calendar-next-active"><a href="https://kidshealth.org/ws/RadyChildrens/en/parents/week17.html/">Next</a></div> </div> <ul> <li class="kh-pregnancy-calendar-days-t1"><a id="khpcd1" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week1.html/">1</a></li> <li class="kh-pregnancy-calendar-days-t1"><a id="khpcd2" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week2.html/">2</a></li> <li class="kh-pregnancy-calendar-days-t1"><a id="khpcd3" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week3.html/">3</a></li> <li class="kh-pregnancy-calendar-days-t1"><a id="khpcd4" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week4.html/">4</a></li> <li class="kh-pregnancy-calendar-days-t1"><a id="khpcd5" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week5.html/">5</a></li> <li class="kh-pregnancy-calendar-days-t1"><a id="khpcd6" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week6.html/">6</a></li> <li class="kh-pregnancy-calendar-days-t1"><a id="khpcd7" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week7.html/">7</a></li> <li class="kh-pregnancy-calendar-days-t1"><a id="khpcd8" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week8.html/">8</a></li> <li class="kh-pregnancy-calendar-days-t1"><a id="khpcd9" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week9.html/">9</a></li> <li class="kh-pregnancy-calendar-days-t1"><a id="khpcd10" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week10.html/">10</a></li> <li class="kh-pregnancy-calendar-days-t1"><a id="khpcd11" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week11.html/">11</a></li> <li class="kh-pregnancy-calendar-days-t1"><a id="khpcd12" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week12.html/">12</a></li> <li class="kh-pregnancy-calendar-days-t2"><a id="khpcd13" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week13.html/">13</a></li> <li class="kh-pregnancy-calendar-days-t2"><a id="khpcd14" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week14.html/">14</a></li> <li class="kh-pregnancy-calendar-days-t2"><a id="khpcd15" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week15.html/">15</a></li> <li class="kh-pregnancy-calendar-days-t2"><a id="khpcd16" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week16.html/" class="kh-pregnancy-calendar-days-active">16</a></li> <li class="kh-pregnancy-calendar-days-t2"><a id="khpcd17" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week17.html/">17</a></li> <li class="kh-pregnancy-calendar-days-t2"><a id="khpcd18" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week18.html/">18</a></li> <li class="kh-pregnancy-calendar-days-t2"><a id="khpcd19" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week19.html/">19</a></li> <li class="kh-pregnancy-calendar-days-t2"><a id="khpcd20" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week20.html/">20</a></li> <li class="kh-pregnancy-calendar-days-t2"><a id="khpcd21" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week21.html/">21</a></li> <li class="kh-pregnancy-calendar-days-t2"><a id="khpcd22" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week22.html/">22</a></li> <li class="kh-pregnancy-calendar-days-t2"><a id="khpcd23" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week23.html/">23</a></li> <li class="kh-pregnancy-calendar-days-t2"><a id="khpcd24" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week24.html/">24</a></li> <li class="kh-pregnancy-calendar-days-t2"><a id="khpcd25" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week25.html/">25</a></li> <li class="kh-pregnancy-calendar-days-t2"><a id="khpcd26" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week26.html/">26</a></li> <li class="kh-pregnancy-calendar-days-t3"><a id="khpcd27" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week27.html/">27</a></li> <li class="kh-pregnancy-calendar-days-t3"><a id="khpcd28" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week28.html/">28</a></li> <li class="kh-pregnancy-calendar-days-t3"><a id="khpcd29" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week29.html/">29</a></li> <li class="kh-pregnancy-calendar-days-t3"><a id="khpcd30" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week30.html/">30</a></li> <li class="kh-pregnancy-calendar-days-t3"><a id="khpcd31" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week31.html/">31</a></li> <li class="kh-pregnancy-calendar-days-t3"><a id="khpcd32" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week32.html/">32</a></li> <li class="kh-pregnancy-calendar-days-t3"><a id="khpcd33" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week33.html/">33</a></li> <li class="kh-pregnancy-calendar-days-t3"><a id="khpcd34" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week34.html/">34</a></li> <li class="kh-pregnancy-calendar-days-t3"><a id="khpcd35" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week35.html/">35</a></li> <li class="kh-pregnancy-calendar-days-t3"><a id="khpcd36" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week36.html/">36</a></li> <li class="kh-pregnancy-calendar-days-t3"><a id="khpcd37" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week37.html/">37</a></li> <li class="kh-pregnancy-calendar-days-t3"><a id="khpcd38" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week38.html/">38</a></li> <li class="kh-pregnancy-calendar-days-t3"><a id="khpcd39" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week39.html/">39</a></li> <li class="kh-pregnancy-calendar-days-t3"><a id="khpcd40" href="https://kidshealth.org/ws/RadyChildrens/en/parents/week40.html/">40</a></li> </ul> <div class="kh-pregnancy-calendar-trimesters"> <ul> <li class="kh-pregnancy-calendar-t1">Trimester 1</li> <li class="kh-pregnancy-calendar-t2">Trimester 2</li> <li class="kh-pregnancy-calendar-t3">Trimester 3</li> </ul> </div> </div> </div>Semana 16Semana 16https://kidshealth.org/ws/RadyChildrens/es/parents/week16-esp.html/e855556a-d79b-4cf4-b0ed-e6222abdc905kh:age-NAkh:clinicalDesignation-obgynkh:genre-toolkh:primaryClinicalDesignation-obgynCalendarhttps://kidshealth.org/ws/RadyChildrens/en/parents/pregnancy-center/pregnancy-calendar/5cf1d7f8-bd89-4e41-8fd9-23b431df98c0https://kidshealth.org/EN/images/promos/PregCal-BabyGrow-enPR.jpghttps://kidshealth.org/EN/images/galleries/PregCal-Week16-enGL.jpghttps://kidshealth.org/EN/images/buttons/PregnancySlideshow-Belly-enBT-1.png