At 26 weeks pregnant, your baby is about 9 inches (23 centimeters) long from crown to rump and weighs close to 2 pounds (820 grams). That’s roughly the length of a spaghetti squash. Your baby is gaining weight steadily now, and this week marks some exciting developmental firsts.
Size and Weight at 26 Weeks
The 9-inch measurement is from the top of the head to the bottom of the buttocks (crown to rump), which is the standard way fetal length is tracked. If you could stretch your baby out from head to heel, the total length would be closer to 14 inches. At nearly 2 pounds, your baby has more than doubled in weight over the past month and will continue putting on fat rapidly through the third trimester. Much of that weight gain from here on out is body fat, which helps regulate temperature after birth.
Keep in mind that these are averages. Babies at the same gestational age can vary by several ounces in either direction and still be perfectly healthy. Your provider tracks growth through ultrasound measurements and fundal height checks to make sure your baby is on a consistent curve.
Eyes Open for the First Time
One of the most notable milestones this week: your baby’s eyes are starting to open. Until now, the eyelids have been fused shut while the retinas and other structures developed. Now your baby can see inside the uterus when their eyes are open, though the view is limited to changes in light and shadow. If you shine a flashlight against your belly, your baby may detect the glow and even kick in response.
The irises don’t have much pigment yet, so eye color isn’t set. Most babies are born with dark blue or gray eyes regardless of their eventual color, which can take months to fully develop after birth.
Brain and Sleep Patterns
Your baby’s brain is becoming significantly more complex around 26 weeks. Brain wave activity is maturing enough that distinct sleep and wake cycles are emerging. You may notice your baby seems to have predictable active and quiet periods throughout the day. Many parents find that their baby is most active in the evening or at night, often right when they lie down to rest.
Hearing is also well established by now. Your baby can hear your voice, your heartbeat, and sounds from outside the womb. Some parents start reading or playing music to their baby at this stage, though your everyday conversations are already providing plenty of auditory stimulation.
Lung Development Is Underway
The lungs are one of the last organs to fully mature, and at 26 weeks they’re in a critical stage of development. The tiny air sacs are forming, and the cells lining them have begun producing surfactant, a slippery substance that keeps the air sacs from collapsing when a baby breathes. Surfactant production started around 24 weeks, but levels are still far too low for the lungs to function independently. Babies born at or before 28 weeks have significant surfactant deficiency, which is one of the main reasons premature infants need breathing support.
The good news is that if a baby is born at 26 weeks, survival rates with intensive care are around 80%. Every additional week in the womb improves lung maturity and overall outcomes considerably.
What Movement Feels Like Now
At 26 weeks, there’s a lot of activity going on inside your bump. You’re likely feeling distinct kicks, rolls, and even hiccups. As your baby gets bigger and stronger, movements become more pronounced. Some will be gentle flutters, while others are strong enough to be visible from the outside.
Most providers recommend starting to pay attention to your baby’s movement patterns around this stage. You don’t necessarily need to do formal kick counts yet, but getting familiar with when your baby is typically active helps you notice if something changes. If you ever feel like movements have slowed down or stopped, contact your midwife or maternity unit right away rather than waiting.
Changes in Your Body
Your uterus is now about 2.5 inches above your belly button. At prenatal appointments, your provider may measure your fundal height, which is the distance from your pubic bone to the top of the uterus. After 20 weeks, this measurement in centimeters roughly matches the number of weeks you are, plus or minus 2 centimeters. So at 26 weeks, a fundal height between 24 and 28 centimeters is considered normal.
You may be noticing more back pain and pelvic pressure as your center of gravity shifts. Braxton Hicks contractions, the irregular tightening of the uterus that feels like your belly briefly hardens, are also common at this point. They’re usually painless and stop when you change position or drink water. Round ligament pain, a sharp pulling sensation on the sides of your lower belly, can catch you off guard when you move suddenly or stand up too quickly. Both are normal parts of your body accommodating a rapidly growing baby.