Second Trimester Guide: Weeks 14–27 of Pregnancy

Last updated: May 2026

The second trimester (weeks 14–27) is often called the "golden period" of pregnancy — and for good reason. Nausea typically fades, energy returns, and your baby bump becomes visible. This is when pregnancy starts feeling real: you'll feel your baby's first kicks, find out the sex (if you choose), and start nesting in earnest.

Here's everything you need to know about what's happening to your body and your baby during weeks 14 through 27.

Body Changes You'll Notice

The most exciting change is your growing bump. Your uterus rises above the pubic bone around week 12 and reaches the navel by week 20. You'll likely need maternity clothes by weeks 14–16, though every body is different. Round ligament pain — sharp, sudden pain on one or both sides of the lower abdomen — is common and caused by the ligaments stretching to support your growing uterus.

Your skin may develop the "linea nigra" (a dark vertical line down your belly), melasma (darker patches on your face), and stretch marks. These are all driven by increased melanin production and hormonal changes. Breast growth continues, and you may notice darkening of the areolas. Your blood volume increases by about 50% by the end of pregnancy, which can cause nasal congestion, occasional nosebleeds, and visible veins.

Between weeks 18–22, you'll feel "quickening" — your baby's first movements. First-time parents often describe it as flutters or bubbles. By week 24, kicks and rolls become unmistakable.

Baby's Development

At week 14, your baby is about 3.5 inches long and can make facial expressions. By week 16, the skeletal system is hardening from cartilage to bone, and the circulatory system is fully functional. Week 18 brings the ability to hear — your baby can hear your heartbeat, your voice, and loud external sounds.

The anatomy scan ultrasound (typically weeks 18–22) is the most detailed scan of pregnancy. It checks your baby's brain, heart, spine, kidneys, limbs, and placenta position. This is usually when you can find out the sex. By week 24, your baby weighs about 1.3 pounds, and the lungs are developing surfactant — the substance that will help them breathe air. Week 24 is also considered the threshold of viability, though babies born this early need intensive NICU care.

Key Prenatal Tests & Screenings

The ACOG recommends several tests during the second trimester. The quad screen (weeks 15–20) is a blood test measuring four markers to assess the risk of neural tube defects and chromosomal abnormalities. The anatomy scan (weeks 18–22) is the detailed ultrasound checking all major organ systems.

A glucose screening test (typically weeks 24–28) checks for gestational diabetes. You'll drink a glucose solution and have your blood drawn one hour later. If results are elevated, a three-hour glucose tolerance test follows. Gestational diabetes affects 6–9% of pregnancies, according to the CDC.

Nutrition & Exercise

You need about 340 extra calories per day during the second trimester — roughly a yogurt and a banana's worth. Focus on protein (71g daily supports baby's rapid growth), iron-rich foods (your blood volume is surging), and calcium. Continue prenatal vitamins and consider adding a DHA supplement if yours doesn't include it.

Exercise remains safe and beneficial. The World Health Organization recommends at least 150 minutes of moderate activity per week. Swimming is particularly comfortable as it takes pressure off your joints. Avoid lying flat on your back for extended periods after week 20, as the growing uterus can compress the vena cava and reduce blood flow.

Gear & Nursery Prep

The second trimester is the sweet spot for big purchases and nursery setup. You have energy, you're not yet too uncomfortable, and many retailers run sales during this window. Key items to research and buy now include a crib or bassinet, a car seat (you can't leave the hospital without one), a stroller, and a changing setup. See our complete baby registry checklist for the full list.

If you're planning a baby shower, it's typically held between weeks 28–32. Now is the time to set up your baby gear timeline so gifts and purchases arrive with time to spare.

Common Discomforts & Remedies

Round ligament pain responds well to slow position changes and a warm (not hot) bath. Heartburn becomes increasingly common as progesterone relaxes the esophageal sphincter — eat smaller meals, avoid lying down after eating, and keep antacids approved by your provider on hand. Leg cramps, particularly at night, may be relieved by stretching, staying hydrated, and ensuring adequate magnesium and potassium intake.

Back pain affects most pregnant people by mid-pregnancy. A pregnancy pillow for sleeping, prenatal yoga, and supportive shoes can help. A maternity support belt distributes the weight of your belly and can provide significant relief during active days.

Frequently Asked Questions

When will I feel the baby move?

Most first-time parents feel movement between weeks 18–22. Experienced parents may feel it as early as weeks 14–16. Early movements feel like flutters, bubbles, or popcorn popping. By week 24, kicks become strong and regular.

Is it safe to have sex during the second trimester?

For most pregnancies, yes. Unless your provider has advised otherwise due to specific complications (placenta previa, cervical insufficiency, or risk of preterm labor), sexual activity is safe throughout pregnancy. The baby is protected by the amniotic fluid and the muscular walls of the uterus.

How much weight should I gain in the second trimester?

About 1 pound per week for people with a normal pre-pregnancy BMI, totaling roughly 12–14 pounds during the second trimester. Your provider will track weight gain at each visit and adjust recommendations based on your starting weight and individual factors.

Should I be doing kick counts?

Most providers recommend starting daily kick counts around week 28 (early third trimester). During the second trimester, simply noting that you feel movement regularly is sufficient. If you notice a significant decrease in movement at any point, contact your provider.

What is round ligament pain?

Sharp, sudden pain on one or both sides of the lower abdomen caused by the ligaments stretching to support your growing uterus. It's triggered by quick movements like standing up, rolling over in bed, or coughing. It's harmless but can be startling. Slow position changes and gentle stretching help.