At five months pregnant, roughly weeks 18 through 22, most people have a visibly rounded belly that sits just below or right at the belly button. The uterus has grown enough that its top (the fundus) reaches the navel by about week 20, making the pregnancy obvious to others for the first time in many cases. But what “five months” actually looks like varies dramatically from person to person, and the changes go well beyond the bump.
How Big the Bump Typically Is
By week 20, the top of the uterus sits at the level of your belly button. From that point forward, the distance from your pubic bone to the top of the uterus, measured in centimeters, roughly matches the number of weeks you are pregnant, give or take about two centimeters. So at 20 weeks, that measurement is close to 20 centimeters, or about 8 inches.
What the bump looks like on the outside, though, depends on several factors. Your height, torso length, and the position of your uterus all play a role. Someone with a shorter torso tends to show earlier and more prominently because the uterus has less vertical space to expand before pushing outward. People who are taller or have longer torsos may still look only slightly rounded at five months.
Previous pregnancies make a significant difference. The abdominal muscles that run vertically down the front of your belly separate along the midline during pregnancy, a process called diastasis. In someone who has never been pregnant, the connective tissue between those muscles averages about 11 millimeters wide. After one pregnancy, that gap more than doubles to roughly 28 millimeters, and after two or more pregnancies it widens further to about 33 millimeters. The muscles also become flatter with each subsequent pregnancy. This means the abdominal wall offers less resistance, and the bump tends to appear larger and earlier the second or third time around.
Skin Changes You Can See
Around the 20-week mark, a dark vertical line often appears running from the pubic bone up toward the belly button, sometimes extending above it. This is the linea nigra. Everyone has a faint line there already, but during pregnancy the placenta produces a hormone that increases melanin production throughout the body. That same process can darken the areolas, cause brown or gray patches on the face (melasma), and make freckles or moles appear slightly darker.
Stretch marks may also begin to show up around month five as the skin over the abdomen, breasts, and hips stretches more rapidly. They often start as reddish or purple lines, though their appearance varies with skin tone.
What the Baby Looks Like at Five Months
By the end of month five, the baby is roughly 6 to 7 inches long measured from head to rump and weighs around 10 to 11 ounces. That’s roughly the size of a banana. The body is becoming more proportional as the limbs catch up to the head, which dominated the earlier months of development.
A waxy, white coating called vernix caseosa now covers the skin, protecting it from the amniotic fluid. Fine, downy hair called lanugo covers much of the body. Eyebrows and eyelashes are forming. The ears have moved into their final position on the sides of the head, and the baby can now hear sounds, including your heartbeat and voice. Fingerprints are developing on the tiny fingertips.
Feeling the Baby Move
Month five is when most people feel their baby move for the first time, a milestone called quickening. If this is your first pregnancy, you’ll likely notice it around week 20. If you’ve been pregnant before, you may pick up on it a few weeks earlier, sometimes by week 16, partly because you know what to look for.
The sensation is subtle at first. People describe it as fluttering like a butterfly, tiny bubbles popping, light tapping, or small muscle spasms. It’s easy to mistake for gas or digestion in the beginning. Over the coming weeks, those faint flickers become unmistakable kicks and rolls.
The Anatomy Scan
Most people have their detailed ultrasound around weeks 18 to 20, which falls right in the middle of month five. This scan is far more thorough than the early pregnancy ultrasound. The technician systematically checks the brain structures, the spacing and size of the eyes, the nose and upper lip, the spine in multiple angles, all four chambers of the heart, the kidneys, bladder, and abdominal wall. Each of the twelve long bones in the arms and legs is individually measured, and the hands and feet are examined on both sides.
Key measurements taken include the head circumference, the distance across the skull, the abdominal circumference, and the length of the thigh bone. Together, these give a reliable estimate of the baby’s size and growth. This is also when many parents learn the baby’s sex, if they want to know. For many people, this ultrasound is the first time the pregnancy feels truly real, because the images are detailed enough to see a face in profile, fingers curling, and the baby changing positions.
Common Physical Discomforts
As the uterus grows more rapidly during the second trimester, the round ligaments on either side of it stretch and widen to keep up. This can cause sharp, sudden pain in the lower pelvis or groin, especially when you change positions quickly, sneeze, or stand up fast. Round ligament pain is one of the most common complaints of month five, and while it can be startling, it’s a normal part of the uterus expanding. It can occur on one or both sides.
Other changes you may notice: your center of gravity is shifting forward, which can affect your balance and posture. Lower back pain is common as the spine adjusts to the added weight in front. Nasal congestion and occasional nosebleeds happen because increased blood volume causes the small blood vessels in the nose to swell. Some people notice their gums bleed more easily when brushing for the same reason.
Weight Gain by Month Five
For someone who started pregnancy at a normal weight (a BMI between 18.5 and 24.9), the general guideline is to gain 25 to 35 pounds total over the full pregnancy, at a rate of roughly one pound per week during the second and third trimesters. By the halfway point at 20 weeks, a total gain of about 8 to 12 pounds is typical, though there is wide individual variation.
Much of that weight isn’t body fat. It includes the growing baby, the placenta, increased blood volume (which rises by nearly 50 percent during pregnancy), amniotic fluid, breast tissue growth, and fluid retention. The bump itself accounts for only a portion of what the scale shows.