28 Weeks Pregnant

28 Weeks Pregnant: Entering the Third Trimester

At 28 weeks pregnant, you are usually entering the third trimester. Care begins to focus more on fetal movement, fetal growth, blood pressure, glucose results, early labor signs, and practical preparation for birth.

Your abdomen may feel larger, and daily movement or sleep may become less comfortable. The top of the uterus may be several centimeters above the belly button. Bump size and weight gain cannot be judged by appearance alone because they vary with pre-pregnancy weight, previous pregnancies, fetal position, and amniotic fluid.

This content is educational only and does not provide a diagnosis or treatment plan. If you have bleeding, severe pain, dizziness, fainting, severe vomiting, fever, or concerning symptoms, consult a licensed clinician in Saudi Arabia.

How is week 28 calculated?

Pregnancy is medically dated from the first day of the last menstrual period, not from the day of fertilization. When you are described as 28 weeks pregnant, this means the calculated pregnancy age is about 28 weeks.

If your last period date is unclear or cycles are irregular, your clinician may use previous measurements or a fetal growth ultrasound to review the estimated timing. You can use the pregnancy due date calculator as an initial estimate, then confirm it during prenatal care.

Symptoms at 28 weeks pregnant

As the third trimester begins, symptoms may shift again. Possible symptoms this week include:

• A heavier abdomen and difficulty finding a comfortable sleep position.
• Lower back, hip, or pelvic discomfort as your balance changes.
• Mild irregular tightening, which should not be painful or regular.
• Leg cramps, especially at night or after standing for long periods.
• Constipation, gas, or hemorrhoids due to hormones and uterine pressure.
• Heartburn or reflux, especially after large meals or lying down.
• Mild swelling in the feet by the end of the day, while sudden or severe swelling needs review.
• Mild shortness of breath with effort, while severe or sudden shortness of breath needs assessment.
• Mild skin itching from stretching or dryness.
• Increased clear or white vaginal discharge without a foul smell or severe itching.

Regular contractions, severe back pain, pelvic pressure, bleeding, or fluid leakage should not be treated as ordinary pregnancy symptoms and need prompt assessment.

What is happening with the baby at 28 weeks?

At 28 weeks, the baby's brain continues becoming more complex. Grooves and folds begin becoming more noticeable on the brain surface, and brain tissue increases as pregnancy progresses.

• The brain and nervous system continue developing, supporting movement and responses.
• The lungs continue maturing, but they still need more time before breathing after birth becomes easier.
• Fat storage under the skin increases, making the baby look gradually rounder.
• Eyebrows and eyelashes are more visible, and scalp hair may continue growing depending on genetics.
• The baby may open and close the eyes and may respond to light or sound in different ways.
• The kidneys continue producing urine within the amniotic fluid.
• Sleep-wake and movement patterns may become easier for some mothers to notice.

Although neonatal care outcomes improve with advancing pregnancy weeks, birth at 28 weeks is still very premature and requires specialized neonatal intensive care.

How big is the baby at 28 weeks pregnant?

At 28 weeks, the baby may be around 36 centimeters from head to heel and may weigh close to 1 to 1.2 kilograms. These numbers are approximate and vary with actual pregnancy age and ultrasound measurement technique.

One measurement is not enough to judge fetal health. If growth needs review, your clinician compares measurements with pregnancy age, previous scans, amniotic fluid, placenta position, and the mother's health.

Fetal movement and kick counts

At the start of the third trimester, fetal movement becomes an important part of follow-up. Your clinician may ask you to notice your baby's usual pattern and may explain how to count movements or use kick counts according to your care plan.

The key is not that the baby moves with the same strength all day, but that you learn what is normal for your baby. If you notice a clear decrease or disappearance of movement that had become familiar, contact your clinician or emergency care depending on severity. Do not rely on drinking something cold or sweet instead of asking for advice when you are clearly concerned.

Rh factor and Anti-D/RhIg at 28 weeks

Around this week, your clinician may review your blood group and Rh factor and Rh antibody screen. If you are Rh-negative and antibodies are not detected, your clinician may recommend an Anti-D or RhIg injection around 28 weeks, and possibly after birth or after bleeding or certain procedures depending on the baby's status and clinical assessment.

This injection is not given to every pregnant woman and should not be decided without blood group, antibody results, and medical history. It belongs in your clinician's care plan.

Tdap vaccine in the third trimester

Your clinician may discuss the Tdap vaccine during pregnancy at this stage, because it helps protect the newborn from whooping cough during the first months after birth. Timing is usually in the third trimester and should follow the local protocol and your health situation.

If you previously had a severe allergic reaction to a vaccine or a vaccine component, tell your clinician before receiving any vaccine.

Glucose screening and tests at this stage

If gestational diabetes screening has not yet been completed between weeks 24 and 28, your clinician may request it now or review the result. Testing may involve an oral glucose tolerance test OGTT or another protocol-based approach depending on your situation.

Your clinician may also review a complete blood count CBC to monitor anemia, or a ferritin test if there is marked fatigue or a history of iron deficiency. A urinalysis and urine culture may be requested if there is burning during urination, pain, fever, or according to the follow-up plan.

If gestational diabetes is confirmed, you may need gestational diabetes follow-up with nutrition planning, glucose monitoring, and treatment if your clinician recommends it.

Follow-up visits after week 28

After entering the third trimester, follow-up visits may become closer than before. Many care plans review the pregnant woman about every two weeks until the final weeks, then weekly near the end of pregnancy, but the schedule varies by case, hospital, and clinician.

During visits, your clinician may review blood pressure, weight, swelling, abdominal growth, fetal movement, glucose and blood results, and any symptoms such as severe headache, visual changes, upper abdominal pain, bleeding, or contractions.

Preparing for birth without rushing

Although birth may still be weeks away, week 28 is a good time to begin calm preparation. A birth plan consultation can be discussed in a flexible way, not as a rigid plan that cannot change.

• Choose where you plan to continue care and give birth, if possible.
• Ask about preterm labor signs and when to go to emergency care.
• Discuss pain relief options, vaginal birth, and cesarean birth if there is a medical reason.
• Prepare contact numbers and a plan for reaching the hospital.
• Write your questions before visits so you do not forget them.
• Discuss a breastfeeding consultation or bottle feeding if you have early questions.

Comfort tips for week 28

• Use a pillow between the knees or behind the back if side sleeping during pregnancy is more comfortable.
• Drink water regularly and focus on fiber to reduce constipation.
• Avoid large meals before bedtime if heartburn is troublesome, and ask your clinician before using heartburn medicines.
• Use gentle movement such as walking if your clinician has not restricted activity.
• Elevate your feet during rest if mild swelling appears by the end of the day.
• Do not start a new medicine or supplement or stop a long-term medicine before a medication review during pregnancy.
• Continue pregnancy vitamins and discuss iron during pregnancy according to your tests.

When may closer follow-up be needed?

You may need high-risk pregnancy follow-up or closer visits if risk factors need monitoring.

• Gestational diabetes or pre-existing diabetes, high blood pressure, thyroid disease, kidney disease, heart disease, or autoimmune disease.
• Pregnancy with twins or more, or pregnancy after fertility treatment.
• Previous preterm birth, previous bleeding, previous cesarean birth with risk factors, or recurrent pregnancy loss.
• An ultrasound finding that needs follow-up, or a difference in fetal growth measurement.
• Anemia, iron deficiency, significant weight gain, or clear low weight.
• A clear decrease in fetal movement after movement has become familiar to you.

Warning signs at 28 weeks pregnant

Seek urgent medical assessment or emergency care, depending on severity, if any of the following occur:

• Clear or increasing vaginal bleeding.
• Watery fluid leaking from the vagina or persistent unusual wetness.
• Regular contractions, clear pelvic pressure, or severe back pain with discharge.
• Severe or persistent abdominal or pelvic pain.
• A clear decrease or disappearance of fetal movement after movement had become familiar.
• Very severe headache, visual changes, upper abdominal pain, chest pain, severe shortness of breath, or sudden swelling.
• Fever, chills, severe pain with urination, or flank pain.
• Persistent vomiting that prevents fluids or causes reduced urination and dizziness.
• Very intense itching, especially on the hands or feet, or itching with yellowing, dark urine, or upper abdominal pain.

Next step

After week 28, third-trimester visits continue, with attention to fetal movement, growth, and birth preparation. Continue to 29 weeks pregnant, or return to the week-by-week pregnancy guide.