At 14 weeks, your baby is about 3.5 inches long from head to rump and weighs roughly 1.5 ounces, making it about the size of a lemon. This is the start of the second trimester, and the baby is beginning to look distinctly human, with a more proportional head, a visible neck, and the earliest wisps of hair covering the skin.
Size and Proportions
That 3.5-inch measurement is taken from the crown of the head to the base of the tailbone, which is how fetal length is measured until later in pregnancy when the legs are long enough to factor in. At 1.5 ounces, the baby weighs about as much as a small egg. While the head is still large relative to the body, the rest of the body is catching up quickly. Earlier in the first trimester, the head made up nearly half of the total length. By 14 weeks, the torso and limbs have grown enough that the proportions are starting to shift toward something more recognizable.
The neck has elongated enough to separate the chin from the chest. In earlier weeks, the head was tucked tightly downward, almost resting on the chest. Now there’s a visible gap between the chin and the upper body, and the baby can tilt its head slightly. The arms and legs are longer and more defined, though the legs still lag behind the arms in development.
Skin and Hair
The skin at 14 weeks is extremely thin and almost translucent. Blood vessels are clearly visible beneath the surface, giving the skin a reddish appearance. There’s virtually no fat under the skin yet, so the baby looks lean and somewhat delicate.
Around this time, a fine, soft layer of hair called lanugo begins to appear across the body. This hair is unpigmented and so fine it’s nearly invisible, but it serves an important purpose. Lanugo acts as an anchor for a waxy coating called vernix that will eventually cover the baby’s skin, protecting it from the amniotic fluid. That coating helps prevent the skin from becoming waterlogged or irritated during the remaining months of pregnancy. Lanugo also increases the surface area of the skin, which supports fetal growth during mid-pregnancy. Most of this hair will shed before birth.
Facial Features
By 14 weeks, the face looks unmistakably like a baby’s face. The eyes, which developed on the sides of the head earlier in pregnancy, have migrated closer together toward the front. They’re still fused shut and won’t open for several more months, but they’re now in approximately the right position. Eyebrows are just beginning to form as faint lines of hair follicles.
The ears have moved from the neck area up to the sides of the head. The nose is more defined, with a visible bridge and nostrils. The mouth can open and close, and the baby may already be making sucking motions. On ultrasound, you can sometimes catch the baby with its thumb near or in its mouth, though coordinated thumb-sucking comes a bit later.
Bones and Skeleton
The skeleton is transitioning from soft cartilage to harder bone tissue, a process called ossification. At 14 weeks, this process is well underway in the long bones of the arms and legs and in the skull, though much of the skeleton is still cartilage. The jawbone is developing secondary cartilage structures around the joint and chin area that will eventually harden. Even the tiny bones in the wrist are beginning to develop their blood supply, a necessary step before they can calcify into solid bone.
The ribs are visible on ultrasound at this stage, and the spine appears as a distinct row of small bright dots. The bones are hardening enough that the baby’s movements, while still too faint for you to feel, are becoming more coordinated. The joints in the arms and legs are functional, and the baby can bend its elbows and knees, curl its fingers, and flex its feet.
Fingers, Toes, and Fingerprints
The fingers and toes are fully separated with no remaining webbing. Tiny nails are beginning to grow on the fingertips. One detail that surprises many people: fingerprint ridges are already starting to take shape on the pads of the fingers. These unique patterns are permanently set before week 20, meaning the process is actively underway at 14 weeks. The exact pattern is influenced by the baby’s position, movement, and the pressure of amniotic fluid on the fingertips, which is why even identical twins end up with different fingerprints.
What You’ll See on an Ultrasound
If you have an ultrasound at 14 weeks, you’ll likely see a recognizable baby shape, complete with a rounded head, visible limbs, and a body that moves. The baby may be stretching, kicking, or turning, though you won’t feel these movements for several more weeks. The heartbeat is clearly visible and typically beats between 150 and 170 times per minute at this stage.
Sex determination is possible at 14 weeks, and when a sonographer can get a clear view, accuracy is high. One study in the Australasian Journal of Ultrasound in Medicine found 100% accuracy in sex predictions made between 14 and 16 weeks, though the sample size at that early stage was small. The external genitalia have differentiated enough to be visible: in males, the genital tubercle has shifted to a raised, upward-pointing position, while in females it points downward or remains horizontal. That said, many providers prefer to wait until the anatomy scan around 18 to 20 weeks, when the baby is larger and the view is more reliable.
Movement and Reflexes
At 14 weeks, the baby is constantly moving. It can squint, grimace, and make facial expressions as the facial muscles become functional. It swallows small amounts of amniotic fluid, which helps the digestive system practice for life outside the womb. The kidneys are producing urine that gets released into the amniotic fluid.
The nervous system is developing rapidly, and the baby is beginning to respond to stimulation. If something presses against the uterus during an ultrasound, you may see the baby shift away. These reflexive movements will become more purposeful over the coming weeks as the brain and spinal cord continue to mature.