Title: Third Trimester of Pregnancy: Fetal Development | American Pregnancy Association
Headings: Third Trimester of Pregnancy: Fetal Development
Third Trimester of Pregnancy: Fetal Development
How Your Baby is Developing Now:
Weeks 27 thru 32 – Gestational Age (Fetal Age – Weeks 25 thru 30)
Weeks 33 thru 36 – Gestational Age (Fetal Age – Weeks 31 thru 34)
Weeks 37 thru 40 – Gestational Age (Fetal Age – Weeks 35 thru 38)
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Content: The bones are fully developed but are still soft and pliable. The fetus is storing its own calcium, iron, and phosphorus. The eyelids open after being closed, since the end of the first trimester. Weeks 33 thru 36 – Gestational Age (Fetal Age – Weeks 31 thru 34)
This is about the time that the fetus will descend into the head-down position preparing for birth. The fetus is beginning to gain weight more rapidly. The lanugo hair will disappear from the skin, and it is becoming less red and wrinkled. The fetus is now 16-19 inches and weighs anywhere from 5 ¾ lbs to 6 ¾ lbs. Weeks 37 thru 40 – Gestational Age (Fetal Age – Weeks 35 thru 38)
At 38 weeks the fetus is considered full-term and is ready to make its appearance at any time. As your baby becomes bigger, you may notice a change in fetal movement. If you notice a decrease in fetal movement, make sure to talk with your doctor.