Second Trimester Week by Week: What Happens in Weeks 14 to 27

The second trimester runs from week 14 to week 27, and many women describe it as the most enjoyable part of pregnancy. The exhaustion and nausea of the early weeks often lift, energy returns, and your bump begins to show properly. Most importantly, this is the trimester when you usually feel your baby move for the first time. This second trimester week by week guide covers how your baby grows, how your body changes and which appointments to expect.

If you are arriving here from the earlier weeks, the whirlwind of organ-building described in our first trimester week by week guide now gives way to growth, practice movements and senses switching on one by one.

Weeks 14 to 17: The Bump Appears

At week 14 your baby is about the size of a peach. The neck has lengthened, the head is more upright, and the baby can make sucking movements. Through weeks 15 and 16 the skeleton begins to harden from soft cartilage into bone, the eyes become sensitive to light shining through the womb, and fine hair called lanugo starts to cover the body.

By week 17 the baby’s hearing is developing and the umbilical cord is growing thicker and stronger. On the outside, your womb has risen out of the pelvis, so a gentle roundness usually appears below your belly button. Many women stop fitting comfortably into their usual trousers around this stage, even though strangers may not notice anything yet. Our guide on baby bump growth by week shows the typical pattern of change across the whole pregnancy.

Weeks 18 to 21: First Movements and the Anomaly Scan

Somewhere between weeks 18 and 22, most first-time mothers feel movement for the first time. Women who have been pregnant before often notice it a few weeks earlier. The earliest sensations are easy to miss: they feel like bubbles, flutters or gentle taps rather than kicks, and they are known as quickening. Over the following weeks they become stronger and more regular as the baby grows.

This is also the window for the anomaly scan, usually offered between weeks 18 and 21. The sonographer checks the baby’s organs, limbs, spine, heart and growth in detail, measures the position of the placenta and confirms how the pregnancy is progressing. It is the longest and most detailed scan of pregnancy for most women, and it is the one at which you can usually find out whether you are expecting a boy or a girl, if you want to know.

Weeks 22 to 24: Senses and Practice Breathing

By week 22 your baby is roughly the size of a papaya, with eyebrows, lips and a stronger grip. Through weeks 23 and 24 the lungs continue developing, the baby practises breathing movements by moving amniotic fluid in and out, and the inner ear is formed enough that balance and hearing are improving. The baby may respond to loud sounds and to familiar voices near the bump.

You may start to notice a pattern to the movements: many babies are more active in the evening when you sit or lie down, partly because you are quieter and more aware of them. A dark vertical line, the linea nigra, may appear on your belly around this stage, and your belly button may start to flatten or pop out. These skin changes are normal hormone effects and usually fade after birth.

Weeks 25 to 27: Towards Viability and Beyond

In the final weeks of this trimester the baby opens its eyes for the first time, develops eyelashes and starts to gain fat under the skin, which smooths out its wrinkled appearance. By week 27 the baby typically measures around 36 centimetres from head to heel and weighs close to 900 grams, about the size of a cauliflower, though every baby grows at its own pace.

From around week 24 onwards, a baby born early has a chance of survival with specialist neonatal care, and that chance improves with every week that passes. This milestone is one reason the late second trimester feels different: the pregnancy is becoming a baby who is nearly ready, with the final growth phase covered in our third trimester week by week guide.

How Your Body Changes in the Second Trimester

For many women, the headline change is relief: nausea eases and energy returns. In its place come the physical signs of a growing womb. Common experiences include:

• A steadily growing bump, with weight gain that is usually more noticeable from now on
• Round ligament pain, a sharp or aching twinge low in the belly when you move quickly
• Backache as your centre of gravity shifts and posture changes
• Heartburn and indigestion as the womb presses upwards
• Congestion and occasional nosebleeds from increased blood flow
• Swollen feet or ankles by the end of the day
• Stretch marks appearing on the belly, hips or breasts in some women
• Leg cramps, often at night

Your midwife will start measuring your bump with a tape measure at appointments from around week 24 to 28, a check called fundal height measurement, which gives a rough guide to how growth is tracking. Blood pressure and urine are also checked at each visit. Around week 26 to 28 many women are offered a glucose test to screen for gestational diabetes, especially if they have any risk factors.

Clothes, Comfort and Everyday Life

This is usually the trimester when ordinary clothes stop working. Waistbands dig in, bras feel tight, and many women move into maternity clothes or larger, stretchier styles somewhere between weeks 16 and 22. When a bump starts showing differs a great deal from woman to woman, depending on build, muscle tone and whether it is a first pregnancy, and our maternity clothing guides can help you buy only what you will actually wear.

Sleep often becomes a project of its own. As the bump grows, sleeping on your side becomes more comfortable, and many women use pillows between the knees or under the bump. Travel is generally easiest in this trimester, before the late-pregnancy tiredness returns, which is why many couples plan a break during these weeks.

Getting to Know Your Baby’s Pattern

By the end of the second trimester, you will probably recognise your baby’s own rhythm of activity and rest. There is no set number of kicks you must count; what matters is learning what is normal for your baby and speaking up if the pattern changes noticeably, especially a clear reduction in movement. Your midwife will ask about movements at every appointment from now on.

Eating, Energy and Weight in the Second Trimester

With appetite usually returning, this trimester is when eating well becomes enjoyable again rather than a battle against nausea. You do not need to eat for two; the baby needs only a modest amount of extra energy, mostly in the final trimester. Regular meals built around vegetables, fruit, whole grains, protein and dairy or alternatives give you and the baby what you need, and iron-rich foods help as your blood volume expands.

Weight gain typically becomes steadier now. How much is healthy varies with your starting weight, and your midwife can talk through what is expected in your case. Sudden large gains or losses are worth mentioning, but ordinary week-to-week wobbles are normal. Our dedicated guide to pregnancy weight gain by week breaks the usual pattern down in more detail if you want the numbers.

Energy in this trimester is precious, so spend it deliberately. Many women use it to return to gentle exercise, clear practical jobs at home and enjoy social life before the heavier final weeks. Walking, swimming and pregnancy yoga classes are popular choices. At the same time, do not be surprised by the odd exhausting day; growing a baby is continuous work even when you feel well.

Bonding and Beginning to Prepare

Feeling movement changes the emotional texture of pregnancy. Talking, reading or singing to the bump sounds sentimental, but babies do learn the sound of familiar voices before birth, and many parents find it helps the baby feel real. Partners can join in by feeling for kicks in the evening, when babies are often most active.

These middle weeks are also a natural time to start preparing in small ways. You might research antenatal classes and book places, since popular ones fill early. You could start a shortlist of names, think about where the baby will sleep, and spread out purchases such as a cot, car seat and pram. There is no deadline pressure yet, which is exactly why this trimester is the pleasant time to do it.

Finally, use this stage to learn the basics of what comes later: how feeding works, what the first days at home involve and what your options are for birth. Reading a little now, while you have energy and headspace, pays off when decisions arrive quickly near the end.

Work, Travel and Everyday Decisions

Because most women feel comparatively well in this trimester, it is often when practical decisions come to the surface. Tell your employer when you feel ready, if you have not already; you will usually need to give formal notice of maternity leave later, but an early conversation makes planning handovers easier. If your job involves heavy lifting, long standing or exposure to chemicals, ask for a risk assessment and adjustments.

Travel, including flying, is generally easiest in these weeks, before airlines apply their late-pregnancy cut-offs and before comfort becomes an issue. On long journeys, move around regularly, stay hydrated and wear flight socks if advised. Whether you travel or stay home, this is a good trimester for gentle normality: seeing friends, enjoying food again and remembering that pregnancy, for all its appointments, is also just life continuing.

This article is general information only, not medical advice, so please check any personal questions or worries with your doctor or midwife.

Conclusion

Weeks 14 to 27 bring the visible, felt reality of pregnancy: a growing bump, first flutters turning into kicks, and a detailed scan that shows a fully formed baby. Enjoy the energy while it lasts, keep your antenatal appointments, and use these weeks to prepare gradually for the final trimester, when growth speeds up again and birth starts to feel close.