Third trimester of pregnancy Third trimester of pregnancy
Week by week fetal development

Learn what is happening to your baby during the third trimester of your pregnancy, and see week by week fetal development using our pregnancy calendar

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Third trimester of pregnancy


3rd Trimester Duration: Weeks 27 through Week 41
fetal development

During the third trimester, you will probably see your doctor more often as it is a time of rapid growth. However, the time is soon arriving so be prepared. Week 27 and 28 will bring further development for the baby's brain and lungs. Your own body will experience breathlessness as the baby grows and your abdomen pushes into your lungs. At this time, the baby will also be able to hear sounds from within the womb.

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fetal development

By week 31, a baby may be born prematurely and survive. Take a sigh of relief. Most of its body organs are complete, and it will now only be gaining weight and size in order to be strong and healthy. The baby will shed its layer of hair, blink, and prepare for its entrance into the world. The rest of the trimester tests your physical capacities. The baby continues to increase in size and weight, and he/she puts pressure on your abdomen, back and your lungs. You will urinate more frequently and experience fatigue. Psychologically, you may become cranky.

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14 15 16 17 18 19 20
21 22 23 24 25 26 27
28 29 30 31 32 33 34
35 36 37 38 39 40 41

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Sex during third trimester
It's absolutely ok to have sex during pregnancy third trimester. Some doctors even recommend to have sex close to your due date to make your labor start sooner. Since because of the extra weight, you might feel uncomfortable, try to experiment to find which position works best.
Vomiting in third trimester
Vomiting and nausea in third trimester could be a sign of labor. If you think you are in labor call your doctor. However, some women still have morning sickness during their third trimester as well as during their first trimester.
Third trimester ultrasound
Most doctors will do at least one ultrasound during the third trimester to measure the baby, and check the development to make sure everything is normal. You might also get one at 36 weeks if the baby is in the head-down position (breech).

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