At 14 weeks pregnant, your baby is about 3½ inches (87 millimeters) long from crown to rump and weighs roughly 1½ ounces (45 grams). That’s about the size of a lemon. This week marks the beginning of the second trimester, and your baby is growing quickly, developing new abilities almost daily.
How Baby’s Size Is Measured
At this stage, fetal size is measured from the top of the head to the bottom of the tailbone, called crown-to-rump length. Legs aren’t included because they’re curled tightly against the body, making a full head-to-toe measurement unreliable on ultrasound.
Not every baby measures the same. At the start of week 14, a normal crown-to-rump length ranges from about 71 millimeters at the 5th percentile to 90 millimeters at the 95th. By the end of the week, that range stretches to roughly 82 to 102 millimeters. If your ultrasound measurement falls anywhere in this window, your baby is on track. Small differences at this stage reflect normal variation, not a problem.
What Your Baby Looks Like Right Now
Your baby is starting to look distinctly human. The head, which was oversized relative to the body in the first trimester, is becoming more proportional. Hair is beginning to sprout on the head and eyebrows. A fine layer of soft body hair called lanugo will soon cover the skin, helping regulate temperature until enough body fat develops later in pregnancy.
The external genitals are now fully developed, though it can still be tricky to determine sex on an ultrasound this early. Facial features are more refined, and your baby can actually make facial expressions: squinting, frowning, even grimacing. These aren’t emotional responses yet, just the muscles and nerves rehearsing movements they’ll use after birth.
Organs Coming Online
One of the bigger milestones around week 14 is kidney function. The kidneys began forming between weeks 5 and 12, and by week 13 they start producing urine. That urine empties into the amniotic fluid, which your baby then swallows, creating a continuous cycle that helps maintain the right volume of fluid in the womb. The liver is also maturing, beginning to produce bile, while the spleen starts contributing to red blood cell production.
Your baby’s thyroid gland is now active and producing hormones that will support growth and brain development throughout the rest of pregnancy. The roof of the mouth (palate) has finished forming, and the intestines, which briefly protruded into the umbilical cord during early development, are now fully settled inside the abdomen.
Movement at 14 Weeks
Your baby is moving almost continuously at this point. These movements include stretching, turning, kicking, and even sucking motions. The body is practicing reflexes: if something touches the palm, the fingers will curl. Your baby can also hold their head up straight rather than letting it flop forward, a sign that the neck muscles are strengthening.
You probably can’t feel any of this yet. Most first-time mothers don’t notice fetal movement until somewhere between 18 and 22 weeks. If you’ve been pregnant before, you might recognize those early flutters a few weeks sooner, but at 14 weeks, your baby is still too small and cushioned by amniotic fluid for the movements to register.
Changes in Your Body
As your baby grows, so does your uterus. It’s now rising out of the pelvis and into the lower abdomen. During the second trimester, it will eventually settle midway between your navel and breasts. You may notice a small, firm bump just above your pubic bone, especially if this isn’t your first pregnancy. For some people, this is the week when regular pants start feeling tight, though visible belly size varies widely depending on your build, muscle tone, and the position of the uterus.
Many of the rough first-trimester symptoms, like nausea and extreme fatigue, begin to ease around now. Energy levels often improve noticeably over the next few weeks. You might experience new symptoms in their place: nasal congestion (from increased blood flow to mucous membranes), a slight increase in appetite, or round ligament pain, a sharp or achy sensation on the sides of your lower belly when you move quickly. These are all normal responses to a growing uterus and increased blood volume.
Week-to-Week Growth Context
To put 14 weeks in perspective, your baby has roughly tripled in length since week 8 and will double in weight over the next three weeks alone. The second trimester is the fastest growth period for building body structures. By next week, your baby will be closer to the size of an apple, and by week 20, they’ll measure about 6½ inches crown to rump. The lemon-sized stage is brief, which is why ultrasound measurements can shift noticeably between appointments just a couple of weeks apart.