At five months pregnant, your belly has likely grown enough that pregnancy is visible to others, your baby is roughly the size of a banana, and you may be feeling those first unmistakable kicks. This stage falls around weeks 17 through 21, placing you solidly in the second trimester and right at the halfway point of pregnancy.
How Big Your Baby Is at 5 Months
Your baby grows rapidly during month five. At week 17, the average fetus measures about 5 inches long and weighs close to 5 ounces. By week 20, that jumps to roughly 6.5 inches and over 10 ounces. Then at week 21, a big shift happens in how length is measured (from crown to rump to crown to heel), and the total length comes in around 10.5 inches with a weight of about 12.7 ounces. In practical terms, your baby goes from the size of a pear to the size of a carrot over the course of this single month.
What Your Baby Can Do Now
Month five brings some remarkable developmental milestones. Around week 18, your baby’s ears start to stand out from the head, and hearing begins. Your baby can now pick up sounds from inside your body (your heartbeat, your digestion) and may even respond to loud noises from outside. By the end of this month, your baby has regular sleep and wake cycles, and your own movements or a sudden noise can wake them up.
The skin is also changing. A greasy, cheese-like coating called vernix now covers your baby’s body, protecting delicate skin from the constant exposure to amniotic fluid. By around week 21, fine downy hair called lanugo covers the entire body, helping the vernix stay in place. Underneath all of this, your baby is practicing swallowing, developing taste buds, and building the fat stores that will eventually fill out those tiny limbs.
What Your Belly Looks Like
This is the month when many people “pop,” meaning the uterus has grown large enough that your belly rounds out visibly. By week 20, the top of your uterus reaches your belly button. That’s roughly the point where your belly measurement in centimeters starts to match your week of pregnancy, so at 20 weeks, expect about 20 centimeters from your pubic bone to the top of your uterus.
How pronounced your bump looks depends on several factors: your height, your build before pregnancy, whether this is your first pregnancy, and the position of your uterus. First-time mothers often show later because their abdominal muscles haven’t been stretched before. Someone on their second or third pregnancy may have been visibly showing for weeks already. Either way, by the end of month five, fitted clothing will make the bump obvious.
Skin Changes You Might Notice
Around week 20, many people notice a dark vertical line running down the center of their belly. This is the linea nigra, and it appears because the placenta produces a hormone that increases melanin (the pigment responsible for skin color). The same hormone can darken your areolas and cause brown or grayish patches on your face, sometimes called the “mask of pregnancy” or melasma. These changes are cosmetic and typically fade after delivery, though sun exposure can make them more pronounced.
Stretch marks may also start appearing on your belly, breasts, or hips as your skin stretches to accommodate your growing uterus. They often start as pink or reddish lines and fade to a lighter color over time.
Feeling Your Baby Move
If you haven’t felt movement yet, month five is when it usually happens. Those first flutters, known as quickening, feel different for everyone. Common descriptions include butterfly wings, tiny bubbles popping, light tapping, or small muscle spasms. If you’ve been pregnant before, you may have noticed these sensations as early as week 16. First-time mothers more commonly feel movement starting around week 20.
Early on, movements are sporadic and easy to miss, especially if you’re busy or on your feet. You’ll notice them more when you’re sitting or lying still. Over the coming weeks, those gentle flutters will grow into definite kicks and rolls that are impossible to ignore.
How You Might Feel Physically
Month five sits in what many people consider the most comfortable stretch of pregnancy. The nausea and exhaustion of the first trimester have typically faded, and you may feel a noticeable boost in energy. Your appetite is likely stronger, and food aversions that plagued you earlier may have disappeared.
That said, a new set of symptoms tends to show up. Rising hormone levels increase your blood volume, which can make the inside of your nose swell. Congestion and nosebleeds are surprisingly common at this stage. You may also feel sharp, quick pains on one or both sides of your lower belly when you stand up, sneeze, or change position quickly. This is round ligament pain, caused by the stretching of the ligaments that support your growing uterus. It’s uncomfortable but harmless.
Other common experiences at five months include leg cramps (especially at night), mild swelling in your feet and ankles, heartburn as your uterus pushes upward against your stomach, and lower back pain as your center of gravity shifts forward. If you started pregnancy at a healthy weight, you’ve likely gained somewhere between 8 and 15 pounds by now, following the recommended pace of about half a pound to one pound per week during the second and third trimesters.
The Anatomy Scan
One of the biggest events of month five is the mid-pregnancy ultrasound, typically scheduled between weeks 18 and 23. This is a detailed scan where a sonographer examines your baby’s anatomy from head to toe. It’s the appointment where many parents learn the sex of their baby, but its real purpose is much broader.
During this scan, the technician checks the skull shape and brain structures, examines the face and lip, evaluates all four chambers of the heart and its outflow tracts, looks at the spine from multiple angles, measures the long bones in the arms and legs, and inspects internal organs including the stomach, kidneys, bladder, and liver. The placenta’s position is also assessed, along with the amount of amniotic fluid.
For most parents, this scan is reassuring. The sonographer is also looking for subtle markers that could indicate chromosomal conditions, but the vast majority of scans come back normal. If anything unusual is found, your provider will explain what it means and whether any follow-up is needed. The scan typically takes 30 to 45 minutes, and you’ll usually get printed images or digital photos to take home.
What Five Months Looks Like Overall
Pulling it all together, five months pregnant is a visible turning point. On the outside, your bump is rounding out, a dark line may be forming on your belly, and your face and chest may show subtle pigment changes. On the inside, your baby has functioning ears, a protective skin coating, regular sleep patterns, and enough room to kick and roll in ways you can feel. You’re at the midpoint of pregnancy, likely feeling more energetic than you have in months, and about to see your baby in impressive detail on the ultrasound screen.