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Third Trimester: Images of Your Developing Baby

We've partnered with the American Institute of Ultrasound Medicine (AIUM), Johns Hopkins, and the March of Dimes to create this unique peak into Baby's development inside the womb. These images reveal all the intricate details of your baby's growth -- from a collection of cells to a full-term newborn. While most women may only receive one or two ultrasounds during pregnancy, which is normal, this slideshow of the 3rd trimester of pregnancy gives you a look at each week of development.
Week 38 Week 38 (36 weeks from conception)

Fetal Size: Length, 14 inches, crown to rump; total length 21 inches. Weight, 6 3/4 pounds.

Fetal Development Milestones: All of Baby's major body systems are working, and she's continuing to practice breathing in utero. Her movements will lessen as she runs out of space.

What You're Seeing: During the last few weeks of gestation, your baby has less and less room to move. A few weeks (and pounds) ago, she may have been kicking and wiggling constantly; now she simply doesn't have enough room. If you or your health care provider have any concerns about your baby's development, especially if her movement becomes too infrequent, you may have an ultrasound to check up on her. This image shows the results of monitoring a baby's heart rate in utero. At the top, the baby's heart beats; below, the lined measurements track and then determine baby's heart rate to make sure it's within the normal range.