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third trimester

The last part of pregnancy, from week 28 until birth.

thurd try-MES-ter noun

What it means

The fetus gains most of its weight and the lungs mature. The pregnant person often has back pain, shortness of breath, heartburn, swollen feet, frequent urination and trouble sleeping. Prenatal visits become more frequent as the due date nears.

For the nurse

Teach lying on the left side to keep blood flowing to the uterus, and the signs of preterm labor and preeclampsia to report.

At a glance

Spanishtercer trimestre
Also writtenthird trimesters

Related terms

intrauterine growth restriction

Slower than expected growth of a fetus in the uterus, with an estimated weight below the 10th percentile for its age.

fundus

The rounded top or base of a hollow organ, most often the top of the uterus.

preterm labor

Labor that begins after 20 weeks and before 37 weeks of pregnancy.

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