Second Trimester of Pregnancy: What Should You Know and Expect?

Becoming a mother is one of life’s most beautiful transformations. And as your pregnancy enters the second trimester, many women finally feel a comforting shift—more energy, more emotional stability, and the breathtaking moment when you may feel your baby move for the first time.
 This stage is often filled with hope, excitement, and growing confidence. At the same time, you might still feel vulnerable or worried about doing everything right for your child. That is completely normal.
 This guide will walk you gently and clearly through what to expect between weeks 13 and 27—helping you feel informed, reassured, and supported every step of the way.

By the time you reach the second trimester, your baby’s organs, blood, and immune system are developing rapidly. Behind the scenes, special cells called stem cells are helping to build these vital structures. These stem cells will later be found in your baby’s umbilical cord blood and tissue at birth, which is why some families begin, during this trimester, to explore the option of cord blood stem cell banking. You don’t need to decide immediately—but this is a calm, practical time to learn about it and ask questions while you’re already attending regular checkups and scans.

Second Trimester of Pregnancy: What Key Changes Begin in This Stage?

The second trimester typically begins around week 13–14 and lasts until week 27.
 It is sometimes called the “golden trimester” because many early-pregnancy symptoms ease, while your baby rapidly grows and becomes more active.

During this stage:

• Nausea often decreases
• Energy usually increases
• The belly becomes more visibly rounded
• Baby’s organs, senses, and limbs develop quickly

How Does This Relate to Stem Cells?

As your baby’s organs and tissues become more defined, stem cells are still actively at work, supporting growth and development. These same types of stem cells are what make umbilical cord blood and tissue medically valuable after birth. Knowing this can help parents understand why preserving these cells is sometimes described as a “once-in-a-lifetime” opportunity—they can only be collected safely and painlessly at the time of delivery.

What Is the 2nd Trimester of Pregnancy?

Medically, the pregnancy is divided into three trimesters:

• 1st trimester: conception to week 13
• 2nd trimester: weeks 13–27
• 3rd trimester: weeks 28 to birth

The second trimester is a time of stabilizing hormones, steady fetal development, and clearer medical milestones such as the 20-week anatomy scan and feeling your baby’s first movements.

Does the Second Trimester Start at 13 or 14 Weeks?

Different sources may give different starting points because:

• Some define trimesters by lunar months (28 days)
• Others define them by calendar months

Healthcare providers today most commonly consider week 13 as the start of the second trimester, though week 14 is also accepted. Both are medically valid.

What Symptoms Commonly Occur in the Second Trimester?

Many women feel relief as nausea, vomiting, and fatigue decrease. But new sensations and mild discomforts may appear.

What Do You Feel in This Trimester?

Most expecting mothers experience:

• A boost in energy
• Improved appetite
• Growing excitement and emotional stability
• Gentle fetal movements (especially from weeks 16–22)

Mild discomforts may include:

• Backache
• Light abdominal stretching
• Occasional dizziness
• Nasal congestion

These symptoms are usually normal but should always be discussed with your provider if they worsen.

What Are Common Discomforts During This Stage?

You may also notice:

• Constipation
• Gum sensitivity or bleeding
• Heartburn
• Leg swelling
• Round-ligament pain—a sharp stretch on the sides of the abdomen
• Emotional ups and downs

Your body is working hard, and these symptoms are mostly expected. Still, listen to your instincts—if something feels unusual, it’s always OK to ask for help.

What Should You Expect in Your Baby’s Development During Second Trimester

The second trimester is a time of extraordinary growth. Your baby becomes more active, more expressive, and more recognizable.

What Happens to the Baby in This Trimester?

During weeks 13–27, your baby:

• Grows from about 7 cm to nearly 36 cm
• Gains significant weight—from 20 g to more than 900 g
• Develops facial expressions, swallowing abilities, and early breathing motions
• Begins coordinated movement—kicking, stretching, turning

What Does the Baby Look Like at This Stage?

Your baby’s features become beautifully formed:

• Head and body proportions become more balanced
• Eyebrows, eyelashes, and soft hair (lanugo) appear
• Skin is thin and slightly transparent
• Muscles grow stronger, making movements more noticeable

What Physical Body Changes Occur for You During This Trimester?

Your body continues adapting to support your growing child:

• Uterus expands upward toward the belly button
• Breasts grow and may leak small amounts of early milk (colostrum)
• Skin changes may appear—linea nigra, stretch marks, or darkening of nipples
• Blood circulation increases, sometimes causing warm skin or visible veins
  

These changes are normal signs of a healthy, evolving pregnancy.

When Should You Seek Medical Help During Second Trimester?

Pregnancy should feel safe, supported, and closely monitored. Although most symptoms are normal, there are times when you should seek medical attention.

When Should You Call Your Provider?

Contact your healthcare provider immediately if you notice:

• Vaginal bleeding
• Severe abdominal pain
• Intense headaches or vision changes
• Fluid leakage
• Fever
• Decreased fetal movements later in the trimester

Your peace of mind matters. Never hesitate to ask questions.

What Are Signs of a Healthy Pregnancy at This Stage?

Most pregnancies progress smoothly, and positive signs include:

• Regular fetal movement developing over time
• Steady uterine growth
• Normal blood pressure
• No concerning bleeding or fluid loss
• Reassuring checkups and scans
  

What Pains Are Normal in This Trimester?

Common, harmless discomforts include:

• Back pain
• Round-ligament pain
• Pelvic pressure
• Mild cramps related to uterine growth

Severe or persistent pain should always be assessed.

How Much Weight Should You Gain in This Stage?

Typical guidelines suggest:

• Approximately 0.5 kg per week in the second trimester
• Total trimester gain of 5–6 kg, depending on your starting weight

Your provider can personalize these recommendations for your health and body.

Can You Travel During Secon Trimester Safely?

Yes—this is often the safest trimester for travel because energy returns and early nausea fades.
 Before longer trips:

• Wear compression socks
• Walk every 1–2 hours
• Stay well hydrated
• Check airline policies if flying

Always consult your provider if you have pregnancy complications.

What Foods Should Be Avoided in This Trimester?

To protect your baby:

• Avoid raw fish and undercooked meat
• Skip unpasteurized dairy
• Limit high-mercury fish (e.g., swordfish)
• Reduce caffeine
• Avoid alcohol completely

Choose wholesome, balanced meals rich in protein, healthy fats, and iron.

When Do You Start Feeling Baby Movements in This Stage?

Many women feel the first flutter—called quickening—between weeks 16 and 22.

How Does Baby Movement Feel at This Stage?

Movements may feel like:

• Light tapping
• Fluttering
• Tiny bubbles
• Gentle swishes

As weeks go by, movements become stronger and more predictable.

What Medical Appointments Occur During This Trimester?

You will typically have prenatal visits every 4–6 weeks.

These include:

• Checking fundal height
• Measuring blood pressure
• Listening to the baby’s heartbeat
• Reviewing symptoms
• Glucose screening (around weeks 24–28)

What Tests Are Done During This Stage?

You may undergo:

• Blood tests for anemia and infections
• Urine tests for protein and glucose
• Gestational diabetes screening between weeks 24–28

What Genetic Screening Tests Are Available During This Stage?

Genetic screening helps identify certain chromosomal conditions.

What Are the Genetic Screening Options in This Trimester?

• NIPT (Non-Invasive Prenatal Testing): analyzes fetal DNA in maternal blood
• Maternal serum screening: measures specific markers
• Diagnostic tests (if needed): amniocentesis for more precise answers

Your healthcare provider will explain which tests are right for your situation.

Because many parents receive detailed information about their baby’s health during this trimester—through blood tests, screening, and ultrasound—this is also a natural time to start asking about cord blood and cord tissue banking. Understanding your baby’s development and genetic health can help you feel more informed when deciding whether to preserve their stem cells for potential future medical use. These conversations are meant to empower you, not pressure you, and your healthcare provider can guide you toward trustworthy information.

What Happens During the 20-Week Anatomy Scan?

This detailed ultrasound examines:

• Baby’s brain, heart, spine, kidneys
• Placental position
• Limb growth
• Organ development
• Gender (if you wish to know)

What Happens Each Week Between 13 and 27 Weeks?

The second trimester is full of milestones.

What Should You Expect at Week 13 to Week 15?

• Early flutters may begin
• Baby’s bones harden
• Your energy usually improves
• Uterus rises above the pelvic bone

What Happens at Week 19 to Week 22?

• Movements become stronger
• Baby’s senses (hearing, taste) develop
• You may see clearer baby bump growth
• The anatomy scan typically occurs around week 20

Frequently Asked Questions About the Second Trimester of Pregnancy

What Do You Feel in This Trimester?

More energy, a growing belly, and early baby movements. Discomforts may include backache, constipation, heartburn, or mild cramps.

When Should You Call Your Provider?

Immediately if you experience:

• Vaginal bleeding
• Severe pain
• Fluid leakage
• Fever
• Significantly reduced movements (later in trimester)

As you move through the second trimester feeling more connected to your baby’s movements and growth, it is natural to start thinking about their future health and safety. Stem cells found in umbilical cord blood and tissue are one of the modern tools families can consider as part of this long-term care. They are collected painlessly after birth, stored for potential future use, and may one day support treatments for certain blood, immune, or metabolic conditions. You are not required to choose this path—but knowing it exists allows you to make a calm, informed, and loving decision that aligns with your family’s values and hopes.