Fetal Perspective

Month 7

The seventh month marks the beginning of the third trimester. The baby continues growing rapidly, fine-tuning its systems, and preparing for life outside the womb. The brain is developing faster than ever, and the baby's sense of awareness increases. Movements are strong and often startling as the baby stretches and shifts in its now tighter space.

Weeks 25 to 28: Key Developments

Week 25:

Development:

The lungs are developing alveoli, the tiny air sacs that will allow oxygen exchange after birth. Surfactant production increases to help keep these sacs open.

The baby's skin becomes more opaque as layers of fat accumulate beneath it, giving the body a plumper appearance.

Hair on the head grows thicker, and the baby may start developing a unique hair texture and color.

Eyes are fully developed and can now open and close. The baby may start blinking in response to light.

The nervous system strengthens, allowing for better coordination of movements.

Size: About 13.5 inches long, similar to a rutabaga or acorn squash.

Weight: Around 1.5–1.8 pounds.

Week 26:

Development:

The baby's heartbeat is stronger and can be heard distinctly during an ultrasound or with a stethoscope.

The auditory system is refined, and the baby can distinguish different sounds and even recognize familiar voices like the mother's and possibly the father's.

Lungs practice "breathing" movements, and the baby may hiccup as it swallows amniotic fluid, which helps strengthen the diaphragm.

The immune system is active, producing antibodies for protection after birth.

Size: About 14 inches long, comparable to a head of lettuce.

Weight: Around 1.8–2 pounds.

Week 27:

Development:

Brain development accelerates, with complex folding (gyri and sulci) forming to increase surface area and allow more neural connections.

The baby's sleep cycle becomes more pronounced. REM sleep begins, suggesting the possibility of early dreaming.

The baby practices sucking and swallowing, preparing for feeding after birth.

Eyes respond to light, and pupils dilate and constrict.

Movements become more restricted but deliberate due to limited space in the uterus.

Size: About 14.5 inches long, similar to a cauliflower head.

Weight: Around 2–2.2 pounds.

Week 28:

Development:

The baby is now considered viable, meaning it has a high chance of survival outside the womb with medical support.

The brain is active and growing, improving memory and processing abilities.

Lungs are maturing rapidly, and the baby begins producing more surfactant.

The nervous system regulates body temperature better.

The eyes can track light and movement outside the womb.

Size: About 15 inches long, comparable to a large eggplant.

Weight: Around 2.5 pounds.

Physical Milestones in Month 7

Lung Development:

Alveoli formation is nearly complete, and the lungs practice rhythmic movements, even though they won't fully mature until closer to birth.

Brain Growth:

Neural connections multiply, making this a critical period for brain development.

Enhanced Senses:

Hearing is sharp, and the baby reacts to sudden noises or soothing sounds.

The baby may show a preference for certain sounds, such as the mother's voice or gentle music.

Movements:

While movements become stronger and more deliberate, the baby is also settling into a head-down position in preparation for birth (though this may vary).

Appearance:

The baby begins to look more like a full-term newborn, with less translucent skin and more defined features.

Mother's Experience in Month 7

Physical Changes:

The uterus continues to expand, and the belly becomes more prominent.

Weight gain accelerates to support the baby's rapid growth.

Braxton Hicks Contractions:

These "practice contractions" may occur more frequently, but they remain irregular and mild.

Baby Movements:

The mother may feel stronger kicks and rolling motions as the baby adjusts to its growing body.

Emotional Changes:

Many mothers feel a mix of excitement and anxiety as birth approaches. Bonding with the baby often deepens as movements become a constant reminder of its presence.

Common Symptoms:

Back pain, swelling in the legs or feet, and difficulty sleeping due to the baby's movements or finding a comfortable position.

Increased shortness of breath as the uterus presses against the diaphragm.

What to Expect at the End of Month 7

By the end of this month:

Size: The baby will measure about 15–16 inches long, roughly the size of a butternut squash.

Weight: The baby will weigh around 2.5–3 pounds.

The baby is preparing for the last stages of development. If born prematurely at this point, the survival rate is high with appropriate medical care, though the baby would require significant support for breathing and regulating body temperature.