At 11 weeks pregnant, your baby is about the size of a fig, measuring roughly 1.5 inches from head to bottom and weighing around 1.6 ounces. The head still makes up about half the total body length, but the rest is catching up fast. This is a week of rapid change: bones are starting to harden, organs are taking on new jobs, and your baby’s body is beginning to look distinctly human.
Overall Size and Proportions
The average crown-rump length at 11 weeks is about 44 millimeters, or just under 1.75 inches. That measurement runs from the top of the head to the bottom of the torso, since the legs are still curled up and hard to measure consistently. The head is large relative to the body, accounting for roughly half the total length. Over the coming weeks, the body will grow faster than the head and the proportions will gradually even out.
Facial Features Taking Shape
Your baby’s face is recognizably human at this point, though still very much a work in progress. The eyes have moved from the sides of the head toward the front, though they’re widely spaced and sealed shut behind fused eyelids that won’t open for months. The ears are low on the head and still migrating toward their final position, which they’ll reach around 16 weeks. Tiny tooth buds are forming inside the gums, and the nasal passages are open. If you have an ultrasound this week, you can often see a clear profile: forehead, small nose, and chin.
Skin, Nails, and Hair Follicles
The skin at 11 weeks is paper-thin and nearly transparent. Blood vessels are clearly visible underneath, giving the skin a reddish appearance. Nail beds are beginning to develop on the fingers and toes, though actual nails won’t grow out to the fingertips until much later in pregnancy. Hair follicles are just starting to form across the scalp and body, laying the groundwork for the fine body hair (called lanugo) that will appear in the second trimester.
Bones Beginning to Harden
Your baby’s skeleton is transitioning from soft cartilage to actual bone. Primary ossification centers, the spots where cartilage first converts to hard bone, begin appearing between weeks 7 and 12. By week 11, this process is well underway in the long bones of the arms and legs, the ribs, and parts of the skull. The skeleton is still mostly cartilage and will remain flexible for a long time, but the hardening process has clearly begun. This is also the stage when skeletal differences can first be detected on ultrasound if they’re present.
What’s Happening Inside
The liver is the star organ at 11 weeks. Before the bone marrow is ready to take over, the liver serves as your baby’s blood cell factory, producing red blood cells and early immune cells. Beyond 11 weeks and five days, these blood cells become increasingly specialized, with red blood cells and early lymphoid cells maturing into more distinct types. The liver also acts as a key vascular hub, connecting blood flow between the placenta and the developing heart.
Other organs are busy too. The intestines, which briefly protruded into the umbilical cord because the abdomen was too small to hold them, are beginning to move back inside. The kidneys are starting to produce small amounts of urine. The diaphragm is forming, which will eventually separate the chest cavity from the abdomen.
Movement You Can’t Feel Yet
Your baby is already moving at 11 weeks, though not quite at the 12-week mark when more coordinated movement typically begins. Early movements include stretching, flexing, and occasional whole-body jerks. The limbs can bend at the elbows and knees, and the fingers and toes are separated and can curl.
You won’t feel any of this yet. The baby is simply too small, and there’s too much cushioning. Most women first feel fetal movement, called quickening, between 16 and 20 weeks. When it does arrive, it feels like fluttering, tiny bubbles, or light tapping rather than the kicks and punches that come later in the third trimester.
Early Stages of Sex Development
At 11 weeks, the external genitalia are just beginning to differentiate. Up until about 9 weeks post-fertilization, male and female embryos look identical in this area. By week 11, the process of differentiation is underway. In female fetuses, external genital development starts at 11 weeks and continues until around 20 weeks. In males, the process typically finishes by 14 weeks. However, the differences are still too subtle to see reliably on ultrasound at this stage. Most providers won’t attempt to determine sex until the anatomy scan around 18 to 20 weeks, though blood-based screening tests can reveal it earlier.
What You’d See on an Ultrasound
If you have an ultrasound at 11 weeks, your baby will look like a tiny but recognizable human figure. The profile view is often the clearest angle, showing the forehead, nose, and chin in silhouette. You’ll likely see the limbs moving, though the movements may look jerky or sudden. The heart is visible and beating rapidly, typically between 150 and 170 beats per minute at this stage. The head will look disproportionately large, which is completely normal.
Many parents have their first-trimester screening ultrasound (sometimes called the nuchal translucency scan) between 11 and 14 weeks, so this may be your first detailed look at your baby. The image quality varies depending on your baby’s position and the type of ultrasound used, but the basic body shape, head, and limb movements are usually easy to spot.