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Third trimester of pregnancy

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Finally, you are in the last phase of your pregnancy i.e. the third trimester i.e. 7th, 8th and 9th month or between 28 to 40 weeks, which is certainly quite close to your due date. This time is completely different from the other two trimester and you have to be prepared for many new experiences. Let’s discover here...


Changes that you will experience

Weight gain

No doubt you will put on weight, which could be as high as 25-35 pounds in addition to your normal weight. This is not only due to your baby but also due to changes in your body like breasts and uterus

Changes in your breasts

You can experience heaviness in your breasts and your bra size will increase. So make sure you wear a proper fitting bra. You can also see secretion of yellowish fluid from your breasts few days before your delivery date. This is known as colostrum.

Tiredness, backache

Tiredness and fatigue are quite obvious. Due to weight gain your will often experience backache. Discomfort in hips and pelvis are natural and even certain movements like bending too low or lifting will be restricted.

Bleeding (optional)

If you have a placenta previa or experience a preterm labour then bleeding from the vagina would occur. Report to your doctor immediately if you notice spotting or bleeding


Look for water breaking or discharge of thick clear liquid from your vagina just close to your delivery date. Inform your doctor immediately.

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Diagnostic tests during second trimester

Glucose intolerance test

By now you must be familiar with this test which is done for gestational diabetes. It would be repeated in your third trimester again.

Testing for Group B streptococcus (GBS)

This test is done during the 37th week of pregnancy to screen for Group B streptococcus (GBS), whose infection can lead to pneumonia, sepsis, meningitis, mental retardation and still birth also. Therefore, rectal or vaginal swabs are collected for analysis. If infection is found out, it can be treated with antibiotics.

Electronic fetal heat monitoring

It could be done any time and even during your labour to monitor the heart rate of your baby.

Other tests

Tests for preeclampsia and other types of tests like non stress tests and contraction stress test are performed only in case of high risk pregnancy.


How your baby develops in second trimester

7th month
By the end of 7th month, your baby measures 14 inches. He/she can hear clearly and can respond well to external stimuli like light and sound. Sexual development continues, eyes are widely opened, hair becomes prominent and the bone marrow starts forming. Your baby can breathe well.

8th month
The internal systems are well developed but the lungs still needs maturation. You can strongly sense the kicking movements. The fat reserves and the protective coating around your baby thickens more by 35th week which add on to weight.

9th month
Your baby is fully matured in the last month. The brain continues to mature and it does even after birth. The chest now becomes prominent and the lungs are fully developed and his/her position changes i.e. head towards the birth canal. By the end of 9th month your baby will be about 18 to 20 inches.

Written by:  healthplus24.com team
Date last updated: June 06, 2014