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: This extra pressure might also cause you to leak urine when you laugh, cough, sneeze, bend or lift. If this is a problem, consider using panty liners. How Your Baby is Developing Now: Weeks 27 thru 32 – Gestational Age (Fetal Age – Weeks 25 thru 30)
The fetus really fills out over these next few weeks, storing fat on the body, reaching about 15-17 inches long and weighing about 4-4 ½ lbs by the 32nd week. The lungs are not fully mature yet, but some rhythmic breathing movements are occurring. 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.