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Pregnancy Calendar

Week 15: Your pregnancy

Week 15: Your pregnancy

Your baby’s growth: Complete skeletal system

Now about the size of a softball, your baby is developing a complete skeletal system and muscles too. This week you also can expect the following:

  • Hair color. Your baby’s hair will start to take on color as it continues growing.
  • Bone marrow. Marrow develops and is the source of stem cells, which are special blood-forming cells in the body.
  • Ears. They’re almost in their final position now, although they’re still a bit low on the head.
  • Thumb sucking. Your baby may begin to suck her thumb, so during an ultrasound, watch closely for this!
  • Eyes. They’re still wide apart, but as your baby’s head continues to take shape, her eyes will continue to move closer together and into their final position.

What’s happening with you

  • Increase blood volume. At this time, your heart pumps about 20% more blood than before you were pregnant to supply your baby with more oxygen. This will continue until your blood volume has increased by 30 to 35%.
  • Measurements. This week your doctor may begin to measure your "fundal height"—the distance from the top of the uterus to the pubic bone. By measuring your fundal height, your doctor can determine whether your baby is growing as expected.
  • Ultrasound. In addition to growth progress, you may be wondering about gender. If you have an ultrasound during the next few weeks, the technician may be able to pinpoint your baby's gender.

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