At 14 weeks pregnant, your fetus measures about 8.1 to 8.4 centimeters (roughly 3.3 inches) from crown to rump, which is about the size of a lemon. That measurement covers the top of the head to the base of the spine, since the legs are still tucked up and difficult to measure consistently at this stage.
How the Measurements Break Down
Crown-rump length is the standard way healthcare providers gauge fetal size during the first trimester and early second trimester. At exactly 14 weeks, the 50th percentile falls between 81 and 83 millimeters. That’s a little over three inches, though individual fetuses can measure slightly above or below this range and still be perfectly healthy. A few millimeters of variation is normal and doesn’t signal a problem on its own.
Weight is harder to pin down at 14 weeks because the fetus is still very small and largely made up of water. Most estimates place it around 40 to 45 grams, or roughly 1.5 ounces. For perspective, that’s about the weight of a small egg.
What Your Fetus Looks Like at 14 Weeks
This is the start of the second trimester, and the fetus is beginning to look more recognizably human. The neck has become more defined, separating the head from the chest in a way that wasn’t visible a few weeks ago. Facial features like the nose, cheeks, and chin are taking shape, and the eyes have moved closer to the front of the face. The ears are nearly in their final position on the sides of the head.
The skin is still extremely thin and translucent. Fine, downy hair called lanugo is starting to appear across the body. This hair helps regulate temperature and will mostly shed before birth. Arms and legs have lengthened enough that they’re now in proportion with the rest of the body, and the fingers and toes are fully separated.
Organs and Body Systems at Work
By 14 weeks, several organ systems are already functioning. The kidneys started producing urine around week 9, and by now they’re actively filtering fluid and releasing it into the amniotic sac. The liver and spleen, which began making red blood cells and platelets around week 10, continue that work. At 14 weeks specifically, the spleen is ramping up red blood cell production, which is a sign the blood system is maturing.
The fetus’s sex organs have developed enough that sex may become visible on an ultrasound around this time, though it’s not always clear yet. Many providers wait until the anatomy scan at 18 to 20 weeks for a more reliable look.
Movement You Can’t Feel Yet
Your fetus is moving constantly at 14 weeks, stretching, turning, and flexing newly formed muscles. Some fetuses begin sucking motions and swallowing small amounts of amniotic fluid, which helps the digestive system practice for life outside the womb. These movements are real and frequent, but the fetus is still too small for you to feel them. Most people start noticing fetal movement between 16 and 22 weeks, with first-time parents typically feeling it later in that range.
What You Might Notice in Your Body
At 14 weeks, the uterus has grown just above the pubic bone, roughly where your pubic hair begins. It’s not yet high enough to create a prominent bump in most people, though some notice their clothes fitting more snugly at the waist. If you’ve been pregnant before, you may show earlier simply because the abdominal muscles have already stretched once.
Many people find that nausea and fatigue start easing around this time. The shift into the second trimester often brings a noticeable bump in energy, though this varies widely from person to person.
What an Ultrasound Shows at This Stage
If you have an ultrasound between 12 and 14 weeks, it’s typically the nuchal translucency scan, which screens for certain chromosomal conditions. During this scan, the provider measures the small pocket of fluid at the back of the fetus’s neck, checks for the presence of the nasal bone, and evaluates blood flow between you and the fetus through the placenta.
Beyond the screening measurements, the scan also confirms the placenta’s position, checks that the umbilical cord is properly attached, and verifies that there’s enough amniotic fluid surrounding the fetus. You’ll likely see the fetus moving on screen, even if you can’t feel it yet. The heartbeat is strong and fast at this stage, typically between 150 and 170 beats per minute.