At 14 weeks pregnant, your baby measures about 8 to 9 centimeters (roughly 3.4 inches) from head to rump and weighs around 1.5 ounces. That’s about the size of a lemon. This week marks the start of the second trimester, and your baby is entering a stretch of rapid growth.
Size and Weight at 14 Weeks
Fetal size is measured as “crown-rump length,” which means from the top of the head to the bottom of the torso (legs aren’t included because they’re curled up). At the start of week 14, the median crown-rump length is about 80.6 millimeters. By the end of the week, it reaches roughly 92 millimeters. That’s a full centimeter of growth in just seven days.
Weight at this stage is approximately 1.5 ounces, or 43 grams. To put that in perspective, your baby weighs about the same as a small handful of grapes. Over the next several weeks, weight gain accelerates significantly as fat stores begin to develop and organs continue to mature.
What Your Baby Looks Like Now
At 14 weeks, your baby is starting to look much more like a newborn. Facial features are becoming more defined, and your baby can already make expressions like squinting, frowning, and grimacing, though these movements are reflexive rather than intentional. The ears have migrated from the neck to the sides of the head, and the eyes, which were on the sides of the face earlier in development, have moved closer together.
The body is catching up to the head in proportions. Earlier in pregnancy, the head made up nearly half the baby’s total length. By now, the body is growing faster, and the limbs are lengthening. Fingers and toes are fully separated, and your baby may already be sucking their thumb.
Key Developments Happening This Week
Week 14 is a busy time for organ development. The kidneys are reaching a milestone: tubular function, the part of the kidney that filters and processes fluid, begins after the 14th week. Your baby’s bladder has been visible on ultrasound since around week 13, and the kidneys are now starting to produce urine that gets released into the amniotic fluid. After 20 weeks, the kidneys will be responsible for producing over 90 percent of the amniotic fluid surrounding your baby.
The roof of the mouth is fully formed by this point, and the intestines, which temporarily developed outside the body in a structure in the umbilical cord, have moved into the abdomen. Your baby’s thyroid gland is also becoming active, beginning to produce hormones that will support growth and metabolism.
Skin and Hair
Your baby’s skin is still translucent and paper-thin, with blood vessels clearly visible underneath. Over the coming weeks (typically between 16 and 20 weeks), a fine, downy hair called lanugo will begin covering the body. This hair serves an important purpose: it helps a waxy coating called vernix stick to the skin, which protects delicate fetal skin from the amniotic fluid. Without this coating, prolonged exposure to the fluid could irritate the skin. Lanugo also plays a role in growth by sending tiny vibrations to sensory receptors when it moves, stimulating development.
What’s Changing in Your Body
At 14 weeks, the top of your uterus (called the fundus) is just above your pubic bone. You may notice a small, firm bump low in your abdomen, though for first-time pregnancies, a visible bump often takes another few weeks to appear. Your uterus has grown from roughly the size of a pear before pregnancy to something closer to a grapefruit.
One of the biggest shifts happening this week is hormonal. The placenta has fully taken over hormone production from the ovaries, a transition that completed around the end of week 12. This handoff is the main reason many people start feeling noticeably better in the second trimester. The intense nausea and fatigue of the first trimester often ease once the placenta assumes control.
The placenta is also ramping up production of hormones that increase your appetite. Both progesterone and a hormone that supports the baby’s energy supply stimulate hunger, which is why you may find yourself feeling much hungrier than usual. This is normal and supports the increased caloric needs of the second trimester, though the actual additional calorie requirement is smaller than most people expect: roughly 300 to 350 extra calories per day.
How 14 Weeks Compares to Other Stages
Growth in early pregnancy is remarkably fast. For context, at 8 weeks your baby was about the size of a raspberry and weighed less than a gram. By 14 weeks, they’ve grown roughly tenfold in length. By 20 weeks, your baby will be about 10 inches long from head to heel and weigh around 10 ounces, more than six times the current weight.
The second trimester is often called the “golden period” of pregnancy because the most intense early symptoms have faded, the risk of miscarriage has dropped significantly, and the baby isn’t yet large enough to cause the discomfort that comes in the third trimester. At 14 weeks, you’re right at the beginning of that window.