28 Weeks Pregnant: Entering the Third Trimester

At 28 weeks pregnant, your baby is about the size of a coconut and the third trimester officially begins. If you are searching for 28 weeks pregnant baby size, symptoms, or development, this week marks a shift as your baby continues gaining strength and your body prepares for the final months of pregnancy.

Growth now becomes more focused on weight gain, brain development, and lung maturity.

At a Glance:
28 Weeks Pregnant
  • Baby size: About the size of a coconut
  • Trimester: Third trimester begins
  • Key hormonal shift: Rising levels of prolactin and other hormones begin preparing the body for breastfeeding.
  • Common symptoms: Stronger movement, back pain, swelling, heartburn, shortness of breath, sleep discomfort
  • Doctor visit: Many providers begin visits every two weeks starting around this stage
  • Emotional theme: A new awareness that the final stage of pregnancy has begun.

At 28 weeks pregnant, your baby measures about 37 to 38 cm from head to heel and weighs around 1 kilogram (2.2 pounds).

Here is what is happening:

  • The brain continues developing rapidly, forming deeper grooves and folds
  • The lungs continue developing air sacs (alveoli) and increasing surfactant production.
  • The baby’s eyes can open and close and may respond to light
  • Sleep and wake cycles are becoming more regular
  • Hearing is well developed and babies may recognize familiar voices
  • Movements become stronger and more coordinated
  • Body fat begins accumulating, helping regulate temperature after birth

Although your baby still has weeks of growth ahead, many major systems are now functioning.

What Is Happening in Your Body at 28 Weeks Pregnant

As the third trimester begins, your body continues adapting to support your baby’s growth.

You may notice:

  • Stronger kicks and movement patterns
  • Back pain or pelvic pressure
  • Swelling in the feet or ankles
  • Heartburn or indigestion
  • Leg cramps
  • Shortness of breath as the uterus presses upward

Your uterus now sits several inches above the belly button and will continue expanding in the coming weeks.

Emotional and Nervous System Changes

Entering the third trimester can bring a mix of emotions.

You may experience:

  • Excitement about meeting your baby
  • Increased focus on preparing for birth
  • Moments of fatigue or emotional fluctuation

This stage often brings a growing sense that pregnancy is entering its final chapter.

3 Focus Areas This Week

Begin Third Trimester Preparation

You may start thinking more about birth plans, hospital bags, and newborn preparation.

Support Circulation and Movement

Gentle walking and stretching can help reduce swelling and support circulation.

Prioritize Rest

Sleep may become more challenging as your body changes, making rest especially important.

Weekly Calm Practice

Place one hand on your belly and take a slow breath in through your nose.

As you exhale, imagine releasing tension from your shoulders and jaw.

Take another steady breath and feel the quiet rhythm of your body.

Silently say:

“My body is preparing for the journey ahead.”

Allow a few slow breaths to settle your mind and reconnect with the calm rhythm within you.

Looking Ahead to 29 Weeks Pregnant

At 29 weeks pregnant, your baby continues gaining weight and strength as the third trimester progresses.

Movement patterns may become more noticeable as space inside the uterus gradually becomes tighter.

This Week’s Guided Episode

Listen to this week’s episode of the Pregnancy Week by Week Podcast for a deeper explanation of 28 weeks pregnant development and a guided reset as you enter the third trimester.


Coming soon

Staying Steady During the Third Trimester

The third trimester is a time of rapid growth and preparation for birth.

Taking moments to pause, breathe, and care for your nervous system can support both your body and your baby during this final stage of pregnancy.

MamaZen offers guided sessions designed to support calm focus, emotional balance, and restorative rest throughout pregnancy.

Frequently Asked Questions

28 Weeks Pregnant: Entering the Third Trimester

How big is the baby at 28 weeks pregnant?
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At 28 weeks pregnant, your baby measures about 37 to 38 cm (around 15 inches) from head to heel and weighs about 1 kilogram (2.2 pounds). This is roughly the size of a coconut.

Is 28 weeks the third trimester?
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Yes. Week 28 marks the beginning of the third trimester, the final stage of pregnancy that continues until birth around week 40.

What symptoms are common at 28 weeks pregnant?
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Common symptoms at 28 weeks include stronger fetal movement, back pain, swelling in the feet or ankles, heartburn, leg cramps, and sleep discomfort as the uterus continues expanding.

How often should the baby move at 28 weeks pregnant?
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Movement becomes stronger and more noticeable around this time. While patterns vary, many providers recommend becoming familiar with your baby’s normal activity levels as the third trimester begins.

At 28 weeks pregnant, the third trimester begins as your baby continues gaining strength and weight.

Movements may feel stronger and your body is gradually preparing for the final months of pregnancy.

Each week now brings steady progress as your baby develops the systems needed for life after birth.

Written by Irin Rubin

Founder of MamaZen

Disclaimer

This content is for informational purposes only and does not replace medical advice. Always consult your healthcare provider with questions about your pregnancy.