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Week 16

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Your Baby's Development

Pregnancy Calendar

Your baby now weighs about 3.9 ounces (110 grams) and measures about 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.

Week 16

Your Body

Between weeks 16 and 18 of pregnancy, your health care provider may offer you a second trimester screening test (known as the multiple marker test or triple screen), which 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.

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 at risk for (not whether they have) neural tube defects such as spina bifida or chromosomal abnormalities such as Down syndrome.

An abnormal result does not necessarily mean that your baby has a problem — but it may mean more testing is required. Talk to your health care provider about the risks and advantages of these tests.

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Note: All information is for educational purposes only. For specific medical advice, diagnoses and treatment, consult your doctor.

© 1995–2014 The Nemours Foundation/KidsHealth. All rights reserved.

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Spring 2014: Good Growing Newsletter

In This Issue

  • Cold Water Shock Can Quickly Cause Drowning
  • E-Cigs Are Addictive and Harmful
  • Bystanders Can Intervene to Stop Bullying

Download Spring 2014 (PDF)

Videos

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Miracle Season 2013 0:57:06Expand
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Miracle Season, hosted by Steve Pool and Molly Shen, aired Dec. 8, 2013, on KOMO 4 TV. The annual holiday special celebrates the remarkable lives of Seattle Children's patients.

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Children’s Mental Health 0:00:30Expand
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Mark Fadool, clinical director of mental health services at Odessa Brown Children's Clinic, provides early warning signs of mental health issues in kids and teens and urges us all to notice the signs and act early.

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