By Cristina Mestre Ferrer BSc, MSc (embryologist).
Last Update: 02/09/2015

The seventh month of pregnancy is the first month of the countdown to childbirth. During the last trimester of pregnancy the woman gains, in average, 5 kilos.

As for the development of the baby, the most significant change is that the quantity of amniotic fluid diminishes and, as a consequence, the baby grows in size. The lungs of the baby develop completely and the ossification of the child’s bones occurs, that is to say, the baby’s bones harden.

The different sections of this article have been assembled into the following table of contents.

General changes by week

At this point, the baby is pressed against your bladder so you’ll not only feel the movements of the fetus but also want to urinate more often. The movements of the fetus will be reduced because, as it grows, the baby occupies more space.

  • The child grows from about 33 cm at the beginning of the seventh month of pregnancy to about 38 cm at the end of the month.
  • The baby’s weight increases, on average, from 800 grams to 1,050 grams.

Changes in your body are normal and impatience and fatigue increase. This is an especially sensitive stage since both mother and baby discover new sensations. An increased amount of blood in your body causes your heart to beat stronger so it can pump the blood more efficiently. Furthermore, you can feel some contractions called Braxton Hicks. These contractions should not be too frequent or else a premature labour can occur.

Week twenty-five of pregnancy

During the 25th week of pregnancy the baby measures around 25cm and weights almost one kilo (around 700 grams).

Throughout this week the future baby starts to have eyelashes and hair on the head, although this hair is not the final one. Regarding the eyes, they acquire color without being completely developed. The eyes can change even after birth and during the first weeks of the child’s life. Several studies claim that eye color is a result of the intervention of several genes.

In this week it is advisable to stimulate the baby’s hearing as it is the sense that evolves the most during this period. Although the embryo is very isolated from the outside, sound waves are able to cross all barriers and the baby can hear them and is stimulated. The voice of the mother and all other sounds or noises are perceived by the baby in a very special way since they are transmitted by the fluids of both bodies.

The embryo’s skin is still wrinkles but it will soften and stretch as the embryo’s size increases. The baby’s teeth are located under the gums but it’s still too early for them to break out. You will be able to tell that, at this stage of the pregnancy, the baby has both periods of rest and of activity.

Week twenty-six of pregnancy

During the 26th week of pregnancy you will feel the skin of your belly stretch, which can produce you some itching. This happens because the baby is already very developed and needs more space. The baby exerts pressure on the uterus that, in turn, exerts pressure against your skin.

Besides itching you may feel other symptoms like constipation due to the increased levels of progesterone in your body. Your heart beats faster because of the increase of blood in your system and this might make you feel more tired, especially when you walk or exercise.

Week twenty-seven of pregnancy

During this week the most important changes occur in the baby’s skin, which is no longer covered by the lanugo. The fetus skin is very wrinkled and covered in vernix, a substance that keeps the skin nourished and protected.

The baby is about 36cm and weights close to 910 grams in average. It has the approximate size of a cauliflower.

During this week the baby can already open and close his eyes. The baby also begins to suck his thumb, a movement that, once born, will help him suck the breast milk. In a way, this is the child’s first learning process.

From now on it will be common for you to feel the baby hiccup. This does not last long and is not uncomfortable to the fetus. On the other hand, the baby is more active because his brain is increasingly developed.

Week twenty-eight of pregnancy

Even though the uterus is dilated, reaching 500 times their normal capacity during the end of this month, the possibilities of movement of your child decrease due to the considerable increase in his length and weight. The embryo is much more embedded in the womb and uterus, so mobility is very low.

You might experience the Restless Legs Syndrome, which is very common among pregnant women even though there is no concrete explanation for why it occurs. You may notice a tingling or urge to move your legs, especially when you are lying down or sitting. This is an uncomfortable feeling because it does not allow you to relax completely, but it’s not an alarming problem.

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Authors and contributors

 Cristina Mestre Ferrer
BSc, MSc
Bachelor's Degree in Biological Sciences, Genetics & Human Reproduction from the University of Valencia (UV). Master's Degree in Biotechnology of Human Assisted Reproduction from the UV and the Valencian Infertility Institute (IVI). Embryologist at IVI Barcelona. More information
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