You. Your Pregnancy. Your Baby.

Pregnancy Calendar: Week Twenty Eight

You have just three more months before your baby reaches full term.

Watch over the next three months as your baby grows dramatically almost trippling its body weight, in order to develop the fat necessary for it to survive in the hostile environment outside of the uterus.

External details

Your baby is growing hair on its head and continues to deposit fat throughout its body.

Internal details

Your baby's developing the complicated structure of membranes, connected by neuronsThe basic nerve cell of the body's nervous system. A neuron contains a nucleus within a cell body. They are classified according to direction in which they conduct impulses, and the number of processes they extend.
Sensory neurons transmit impulses to the spinal cord and brain. Motor neurons transmit impulses from the brain to the muscles and glandular tissue.
Neurons work according to electrochemical processes involving positively charged sodium and potassium ions and the changing electrical environment of the intracellular and extracellular fluid of the neuron itself.
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that make the brain. It is growing the deep folds of tissue that maximize the brain's surface area.

Your baby recognizes when you are speaking and increases its heartbeat. It is important for your baby to acknowledge your speech because it will then be able to recognize your voice after birth.

Your changing body

From this week on you will probably start to visit your doctor or midwife every couple of weeks. If you go this week you may undergo a variety of tests including an iron level test to test for physiological anemia and a glucose tolerance test to test for gestational diabetes.

If you are Rh-negative, you will also undergo an antibodyA protein immunoglobulin which is produced naturally by the body and is essential to the immune system by working to combat foreign bodies, germs or bacteria. They are produced by thelymphoid tissue and consist of different classes each of which is designed to fight specific antigens. They include agglutinins, bacteriolysins, opsonins and preciptin.
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check. This is to ensure that your immune system has not created antibodies in reaction to your baby's blood group, which could cause babies in subsequent pregnancies to become jaundicedThe yellow staining of the skin, mucus membranes and sclerae of the eyes, caused by excessive quantities of bilirubin in the blood.
Jaundice may cause nausea, vomitting and abdominal pain, as well as unusually dark urine.
Jaundice is a symptom of many disorders including liver disease, biliary obstruction and hemolytic anemias. Newborn babies often develop physiological jaundice which disappears after a few days.
Visit our comprehensive glossary for more pregnancy terms and definitions.
and anemic. If you are Rh-negative, ask your doctor to explain the results of an immune reaction to your baby's blood.

Born this week

Pregnancy Tip!
  • If you are Rh-negative your doctor will give you a RhoGAM injection which protects your body from becoming sensitized if your baby's blood mixes with yours.

By week twenty eight, the chances of survival are over ninety percent (9 in 10), and every week that the baby remains in the uterus and gains weight increases the likelihood of a successful outcome. By the time your baby weighs more than 3lbs, the chances of survival are ninety five percent.

Inside your baby is still lacking surfactant, a greasy substance that prevents your baby's lungs from sticking and helps your baby breathe so your baby would require artificial respiration. Your doctor can administer a test called the l/s ratio and phosphatidyl glycerol test to measure the maturity of your baby's lungs and determine whether it can breathe on its own.

A liver, brain and immune system that aren't yet fully developed, make your baby susceptible to infections that a full term baby would easily fight.


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