Pregnancy Week by Week
(First, Second, and Third Trimester)
- Pregnancy facts*
- What is the first trimester (week 1-week 12)?
- What is the second trimester (week 13-week 28)?
- What is the third trimester (week 29-week 40)?
- How will my baby develop week by week?
- What are the changes that happen to a woman's body during her 1st, 2nd, and 3rd trimesters of pregnancy?
- Body aches
- Breast changes
- Fatigue, sleep problems
- Heartburn and indigestion
- Hemorrhoids during pregnancy
- Leg cramps
- Morning sickness
- Nasal problems
- Numb or tingling hands
- Stretch marks, skin changes
- Urinary frequency and leaking
- Varicose veins
- Stages of Pregnancy - Slideshow
- Pregnancy Myths and Facts FAQs
- Patient Comments: Pregnancy - Describe Your Experience
- Patient Comments: Pregnancy - Signs
- Patient Comments: Pregnancy - Morning Sickness
- Find a local Obstetrician-Gynecologist in your town
*Pregnancy facts medical author: Melissa Conrad Stöppler, MD
- A normal pregnancy lasts about 40 weeks and is grouped into three trimesters.
- Symptoms of early pregnancy include the absence of menstrual periods, breast changes, tiredness, nausea, mood swings, or other symptoms.
- A pregnancy test measures the hormone human chorionic gonadotropin in the urine or blood.
- Symptoms of late pregnancy can include heartburn, difficulty sleeping, swelling of the ankles or fingers, hemorrhoids, and mild contractions.
- By the end of 37 weeks, a baby is considered full term and its organs are ready to function on their own.
- As you near your due date, your baby may turn into a head-down position for birth. Most babies "present" head down.
- Babies at birth typically weigh between 6 pounds 2 ounces and 9 pounds 2 ounces and are 19 to 21 inches long. Most full-term babies fall within these ranges.
Pregnancy lasts about 40 weeks, counting from the first day of your last normal period. The weeks are grouped into three trimesters (TREYE-mess-turs). Find out what's happening with you and your baby in these three stages.
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