At 14 weeks, you’ve just crossed into the second trimester, and both you and your baby are hitting a turning point. The exhaustion and nausea of the first trimester are typically fading, your baby is growing rapidly, and a new set of physical changes is taking their place.
How Big Your Baby Is at 14 Weeks
Your baby measures about 87 millimeters (roughly 3.4 inches) from crown to rump and weighs around 43 grams, a little over an ounce. That’s about the size of a lemon. Growth is accelerating now. Over the next few weeks, your baby will start gaining weight faster as fat stores begin to develop under the skin.
The body is also catching up to the head in proportions. Earlier in pregnancy, the head made up nearly half the baby’s total length. By 14 weeks, the body is lengthening, the neck is more defined, and the limbs are growing longer. Your baby can make facial expressions now, squinting and grimacing as the facial muscles connect to the brain. Tiny, fine hairs called lanugo are starting to cover the skin, helping regulate body temperature until there’s enough fat to do the job.
What’s Developing Inside
At 14 weeks, your baby’s organs are transitioning from forming to functioning. The liver is producing bile. The spleen is beginning to make red blood cells. The kidneys are filtering fluid, and your baby is actually swallowing amniotic fluid and producing small amounts of urine.
One organ that isn’t yet independent is the thyroid. For the first 18 to 20 weeks of pregnancy, your baby depends entirely on you for thyroid hormone, which plays a critical role in brain development. This is one reason your own thyroid function matters so much during pregnancy, and why it’s sometimes checked early on.
The reproductive organs are also developing. Though it’s still early for most ultrasound techs to determine sex visually, the external genitalia are beginning to differentiate. Some parents find out the sex around this time through earlier genetic screening results rather than an ultrasound.
Why You’re Starting to Feel Better
The shift into the second trimester brings a hormonal change that explains why many women suddenly feel like themselves again. During the first trimester, levels of hCG (the hormone responsible for much of your nausea) climb steeply, peaking between 8 and 12 weeks at levels as high as 210,000 µ/L. By weeks 13 to 16, those levels are dropping. The range falls to 9,000 to 210,000 µ/L and continues trending downward from there.
At the same time, the placenta is taking over hormone production. Earlier in pregnancy, a temporary structure called the corpus luteum handled most of the progesterone your baby needed. By 14 weeks, the placenta has largely assumed that role, stabilizing your hormone levels and reducing the wild fluctuations that made the first trimester rough.
The result: your energy is returning, your appetite is coming back, and morning sickness is easing for most women. Not everyone feels the relief right at 14 weeks. Some people find nausea lingers until 16 or even 20 weeks. But the overall trend is toward feeling significantly better.
New Physical Changes to Expect
As your uterus expands above the pelvic bone, you may notice a small but visible bump forming. This varies a lot depending on your body type and whether this is your first pregnancy. First-time mothers often show later because the abdominal muscles haven’t been stretched before.
One common new sensation is round ligament pain: sharp or aching pains on one or both sides of your lower belly. The round ligaments support your uterus, and as it grows, these ligaments stretch and pull. Quick movements, standing up fast, or even sneezing can trigger a brief, stabbing pain. It’s uncomfortable but harmless, and it tends to come and go throughout the second trimester.
You might also notice nasal congestion that seems to come out of nowhere. Increased blood volume (which rises by about 50% over the course of pregnancy) causes the mucous membranes in your nose to swell. Some women get nosebleeds for the first time. Breast tenderness from the first trimester often eases up around now, though your breasts will continue to grow.
Prenatal Screening in This Window
The 14-week mark falls within an important window for prenatal testing. Your provider may offer second-trimester blood screening that checks for conditions like Down syndrome and spina bifida. These are screening tests, not diagnostic ones, meaning they estimate risk rather than give a definitive answer.
If you had first-trimester screening (blood work combined with a nuchal translucency ultrasound), your provider may review or integrate those results now. If any screening results come back with elevated risk, the next step is typically a diagnostic test like amniocentesis, which is usually performed between 15 and 20 weeks and gives a definitive answer about chromosomal conditions.
If you opted for cell-free DNA screening (a blood test that can be done as early as 10 weeks), you may already have results, including fetal sex. Your 14-week visit is a common time to discuss those findings.
Nutrition and Calorie Needs
Your calorie needs increase in the second trimester, but not by as much as you might think. Most normal-weight women need about 2,200 calories per day during this phase, which works out to roughly 300 extra calories compared to pre-pregnancy intake. That’s the equivalent of a banana with a tablespoon of peanut butter and a glass of milk.
What matters more than total calories is what you’re eating. Iron needs increase significantly because your blood volume is rising. Calcium supports your baby’s developing bones. And because your baby’s thyroid depends on your supply, getting enough iodine (found in dairy, eggs, and iodized salt) is particularly important right now. If you’ve been struggling to eat well because of first-trimester nausea, the return of your appetite is a good opportunity to reestablish balanced meals.
Sleep and Comfort
At 14 weeks, your uterus is just becoming large enough that sleeping positions start to matter. Side sleeping is the recommended position throughout pregnancy. The left side is especially beneficial because it allows the most blood flow to the placenta and improves kidney function, helping your body process fluids and reduce swelling.
Lying flat on your back puts pressure on the vena cava, the large vein that returns blood from your lower body to your heart. At 14 weeks, this pressure isn’t usually significant enough to cause problems, but it’s a good time to start building the side-sleeping habit. A pillow between your knees or a pregnancy pillow can make the transition more comfortable. Stomach sleeping is still physically possible for some women at this point, but it will become impractical soon as your belly grows.