Pregnancy

Second Trimester: The Middle Months, Explained

Save

The second trimester runs weeks 13 to 27 and is often the most comfortable stretch. Early nausea usually fades, energy returns, and most people feel first movement, or quickening, between 16 and 25 weeks. Key screening, including the anatomy scan and gestational diabetes test, falls in this window, while a clinician tracks your blood pressure.

Last updated: July 2026

Talk to a clinician

Gale can help you find a clinician in your state and request a visit.

Find care →

What changes in the second trimester?

The second trimester begins around week 13 and typically brings noticeable relief. According to the Office on Women's Health, morning sickness and extreme fatigue usually ease as the placenta matures and takes over hormone production 1. Many people describe a return of energy and appetite that makes these middle months feel more manageable.

The uterus rises out of the pelvis, so a visible bump often appears between weeks 16 and 20, and round ligament stretching can cause brief, sharp pulls low in the abdomen. This is also when gestational diabetes screening is usually scheduled, generally between weeks 24 and 28. Some people also notice increased vaginal discharge and occasional dizziness as blood vessels relax.

When will I feel the baby move?

First movements, known as quickening, are one of the milestones of the second trimester. Most first-time mothers feel them between about 18 and 25 weeks, while those who have been pregnant before often notice them a little earlier, around 16 weeks 1. Early flutters can feel like gas bubbles or a light tapping before they grow into unmistakable kicks.

Movement patterns become more regular toward the end of this trimester. Feeling movement is reassuring, but at this stage patterns are still establishing, so an occasional quiet day is not unusual. A clinician can review how to track movement as you approach the third trimester, since counting distinct movements becomes more useful once a pattern is clearly established.

Which aches and changes are normal now?

A range of new but normal changes tends to surface in the middle months. Back pain, mild swelling, nasal congestion, heartburn, and skin changes such as a darkening line down the belly are all common as the body adapts. Support and gentle movement help, and our guide on back pain during pregnancy covers practical relief, while many people also ask about preventing stretch marks as the belly grows.

According to ACOG, most people can safely aim for at least 150 minutes of moderate activity a week during pregnancy, which supports mood, sleep, and circulation 2. Iron needs climb steadily, and ACOG defines second-trimester anemia as a hemoglobin below 10.5 g/dL 3.

Does the second trimester feel different at every age?

Age and pregnancy history influence how these middle months feel. A first pregnancy often brings later, subtler quickening than a second or third, and pregnancy after 35 or in the teen years can shift screening priorities even when day-to-day symptoms look similar. Blood pressure and growth are watched closely across every age group because conditions like preeclampsia can emerge in the second half of pregnancy.

According to NICE guidelines, regular antenatal checks continue through this period to catch changes early 4. Recognizing the warning signs of preeclampsia helps you know which symptoms merit a same-day call, though comfort levels still vary widely from week to week. First pregnancies also tend to show a bump later than subsequent ones.

When second-trimester symptoms need a clinician

Some second-trimester symptoms warrant a prompt call rather than watchful waiting. Vaginal bleeding, a gush or steady leak of fluid, severe headache with vision changes, sudden swelling of the face or hands, or a noticeable drop in fetal movement after 24 weeks are reasons to seek same-day review 4. Persistent belly pain, painful urination, or signs of preterm labor also merit attention. Painful, burning urination in particular can signal an infection that needs testing rather than waiting.

Most of the second trimester is smooth and even enjoyable, but a clinician can interpret which symptoms are ordinary and which need a closer look. Gale can help you organize your questions before each prenatal visit.

Common questions

For many people, yes. Nausea and fatigue often lift as hormone levels settle and the placenta matures, and energy tends to return. Not everyone gets this reprieve, and some symptoms like heartburn or back pain may appear or worsen.

Most first-time mothers feel quickening between about 18 and 25 weeks, and people who have been pregnant before often notice it a bit earlier. Movement patterns are still establishing in the second trimester, so occasional quiet stretches are usually normal.

The mid-pregnancy anatomy scan and gestational diabetes screening, usually between weeks 24 and 28, both fall in this window, along with routine blood pressure and urine checks. A clinician explains which tests apply to your pregnancy.

Back pain, round ligament pulls, mild swelling, and heartburn are all common as the body adapts to a growing uterus. Gentle activity and support often help, though severe or one-sided pain deserves a clinician's review.

Related

Say it back

How would you explain this to someone you love?

Two or three sentences, just as you’d say it. Gale reflects back what you focused on — a mirror, not a quiz.

Talk to a clinician

Gale can help you find a clinician in your state and request a visit.

Find care →

Second-trimester symptoms that need review

  • —Vaginal bleeding or a steady leak of fluid in the second trimester is a reason to seek same-day obstetric review.
  • —Severe headache with vision changes or sudden facial swelling can signal preeclampsia and is a reason to seek urgent care.
  • —Regular tightening, pelvic pressure, or low back pain before 37 weeks can suggest preterm labor and is a reason to contact your clinician right away.
  • —A clear drop in fetal movement after 24 weeks is a reason to seek prompt review the same day.

If you have heavy bleeding, a severe headache with vision changes, fainting, or signs of preterm labor, contact your obstetric clinician right away or go to the nearest emergency room; call 911 for heavy bleeding with dizziness or fainting.

This article is general health education, not medical advice. Whether your second-trimester symptoms are routine or need evaluation depends on your history and exam findings, and that judgment rests with your obstetric clinician or midwife.

References

  1. 1.Office on Women's Health (U.S. HHS) (2025). Prenatal care. Office on Women's Health (womenshealth.gov), U.S. HHS. link ✓General framing of second-trimester changes, the easing of early symptoms as the placenta matures, and typical quickening timing.
  2. 2.American College of Obstetricians and Gynecologists (2020). Physical Activity and Exercise During Pregnancy and the Postpartum Period: ACOG Committee Opinion, Number 804. Obstetrics & Gynecology. doi:10.1097/AOG.0000000000003772 ✓ACOG recommendation of at least 150 minutes of moderate-intensity activity per week during pregnancy in the absence of complications.
  3. 3.American College of Obstetricians and Gynecologists (2021). Anemia in Pregnancy: ACOG Practice Bulletin, Number 233. Obstetrics & Gynecology. doi:10.1097/AOG.0000000000004477 ✓ACOG definition of anemia in pregnancy, including a second-trimester hemoglobin threshold below 10.5 g/dL and rising iron demand.
  4. 4.National Institute for Health and Care Excellence (2024). Antenatal care (NG201). National Institute for Health and Care Excellence (NICE). link ✓Antenatal care schedule with regular checks through the second trimester and surveillance for preeclampsia and other complications.

4 sources, numbered by first appearance. General health information, not medical advice. AI-assisted editorial content — every citation independently verified. Editorial policy

← Back to the health library