25 weeks of gestation: what’s new in this phase?

During this phase, for the woman and the fetus, each week means changes. With 25 weeks of gestation, the pregnancy is already more advanced and the woman is in the second trimester.

It is not exactly the final stretch of pregnancy, but the baby is already much more developed, as it is already in the sixth month of pregnancy .

The 25th week is marked by the development of the brain, with the cerebral cortex forming elaborate layers. It is also from this week that the baby starts to get more agitated, giving kicks and punches while moving in the mother’s belly.

Check below the main characteristics of the baby and symptoms presented by the pregnant woman this week.


What is the ideal weight for a 25-week-old fetus?

The weight of the fetus can vary widely, regardless of the gestational week. Normally, at 25 weeks, on average the baby should weigh between 600g and 800g. In this phase, you can put on weight from 30g to 50g a day.

How big is the baby at 25 weeks?

The 25-week-old baby is about the size of a corn cob or broccoli. In centimeters, it measures approximately 30cm to 33cm (measuring from head to heel).

How is the development of the baby at 25 weeks?

At 25 weeks of gestation, the baby’s skin is still thin, wrinkled and paler. Gradually, with the development of blood vessels under the skin, it becomes more pink.

In addition, with weight and muscle gain, little by little, the baby’s skin tends to become less thin.

The lungs and nostrils are opening, and the baby’s respiratory system begins to develop. Even without the entry of air, the organ is able to perform some breathing exercises.

That week and throughout the sixth month, the baby is at a stage where it is considered smarter. This is because the cerebral cortex begins to develop, having more elaborate layers, with the characteristic grooves of the organ more evident).

The baby’s senses are also rapidly developing, making it possible for him to be able to perceive sounds and external lights. By the end of pregnancy, these senses will be even more acute.

It is possible that the pregnant woman starts this week to feel small kicks and punches of the fetus, because the baby moves a lot in the womb (still with a lot of space for the baby to put on weight and grow).

This movement is also due to the release of cortisol produced by the adrenal glands, a hormone that interferes with the baby’s stress and agitation since pregnancy.

Its head is also much bigger when compared to the body, but it is not as disproportionate as before.

Some more subtle physical characteristics, such as color and texture of the hair, trace of the lips, color of the eyes are already perceived. However, until the end of pregnancy, hair color can change.

Symptoms and changes in the pregnant woman at 25 weeks of gestation

The 25th week of gestation is not a phase in which the mother commonly has many symptoms. In fact, it can be considered the most comfortable phase for some women, as they hardly present nausea at the beginning of pregnancy and body pain at the end of pregnancy.

But, as everything is relative when it comes to pregnancy (because each organism reacts differently), some may have characteristic symptoms and more noticeable changes. Are they:

Belly size

At 25 weeks of gestation the pregnant woman’s belly has already grown a lot. Until the end of pregnancy, with the baby growing and gaining weight, the belly tends to get even bigger.

Therefore, some women may already feel some discomfort caused by the size and weight of the belly. In addition, they may experience pain in the back and pelvis, usually milder than in the last month of pregnancy.

In addition to the size, pregnant women may notice the appearance of an itch in the belly area, causing due to the fact that the skin stretches a lot at this stage.

Difficulty sleeping

Because of the size of the belly, some women cannot find a comfortable position to sleep. In this way, they may have impaired sleep quality. It is more common in late pregnancy, but now, in the sixth month, it is also common to occur.

Mothers may also have difficulty sleeping because they feel a greater urge to urinate, having to get up constantly to go to the bathroom.

Other factors that interfere with sleep are the hormonal and emotional side. During pregnancy, the increase in estrogen and progesterone can interfere with the rhythm of sleep.

In addition, the anxiety and fear of childbirth can make women more tense, having difficulty staying relaxed for a good night’s sleep.

Read more: Discover the benefits of pilates in pregnancy

Difficulty breathing

In this phase, with the baby’s accelerated growth, there is a greater pressure on the diaphragm. The uterus, at 25 weeks of gestation, is approximately 25 cm in diameter.

Therefore, the woman may have a little more difficulty in breathing, becoming tired easily.

Frequent urge to urinate and UTIs

The pregnant woman tends to feel more and more the urge to go to the bathroom to urinate, as the baby tends to press the bladder. It is quite common during the final stretch of pregnancy, and the risk of Urinary Tract Infections (UTIs) is also recurrent.

Therefore, the woman must be aware of the symptoms, which include burning, unpleasant smell and pain when urinating. If the woman identifies any of the symptoms, she should seek medical advice and never self-medicate.

Read more: Urinary tract infection can lead to abortion


Between the 24th and 28th weeks of gestation, it is important that the woman is attentive to the glucose screening test to check blood sugar levels. This must be done to prevent and diagnose gestational diabetes , a condition that affects about 2% to 5% of pregnant women.

Usually, the condition disappears after the baby is born, but follow-up should be done throughout the pregnancy.

The test to detect the disease is simple. The pregnant woman should consume a sugary solution so that blood can be collected afterwards.

If the tests show high blood sugar levels, the woman should be referred for another glucose test to confirm the condition.

If the diagnosis is confirmed, the pregnant woman must start treatment, which consists of a specific diet and, if the doctor deems it necessary, medication.