Week 14 · Second trimester
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Week 14 fetal development and pregnancy guide — length about 8.7cm, weight 约43g (about the size of a a kiwi)

Your baby is now about 8.7cm and 约43g, about the size of a a kiwi.

Medical references: WHO INTERGROWTH-21st · China Prenatal & Pregnancy Care Guide · ACOG

View each day of week 14 →

Week 14 fetal development milestones: length / weight / ultrasound data

Key developmental changes during week 14:

  • Facial expressions grow richer: it can frown, make faces, and its eyes begin to move left and right
  • The kidneys keep producing urine released into the amniotic fluid, and the fluid volume increases
  • The neck forms, and the head no longer rests against the chest
  • Lanugo (fine body hair) begins to cover the whole body
  • The liver begins secreting bile, and digestive function is progressively established
  • Hair follicles form deep in the skin, laying the foundation for whole-body hair growth
  • Meconium (the dark-green first stool) begins to accumulate in the intestines
  • Movements shift from spasmodic reflexes to smoother, more coordinated spontaneous motion
  • It begins sucking and chewing movements — preparing for feeding after birth
  • The hard palate (hard bony roof of the mouth) keeps developing and ossifying — preparing for sucking and swallowing after birth
  • Unique fingerprints are forming on the fingertips — weeks 13-19 are the critical period for establishing ridge patterns
  • The external genitalia continue to differentiate, but ultrasound at week 14 usually still can’t tell the sex clearly; it becomes clearer roughly after week 16
Illustration of your baby about the size of a kiwi at week 14 (about 8.7cm/约43g)
Week 14 size: about the size of a a kiwi
BPD (biparietal diameter)26.4mmWidth across the head; reflects brain development
AC (abdominal circumference)78.4mmAbdomen circumference; reflects nutrient absorption
FL (femur length)12.2mmThigh bone length; tracks gestational age
Ultrasound parameters at week 14: BPD 26.4 mm, AC 78.4 mm, FL 12.2 mm (median reference)
Week 14 three core ultrasound parameters (median; varies by individual)

* Values are medians from WHO/China standards; individual variation is normal. References: WHO INTERGROWTH-21st, China Prenatal & Pregnancy Care Guide, ACOG guidelines.

Week 14 daily development

Your baby quietly grows every day of week 14. Tap any day to see fetal development, maternal changes, and daily guidance for that day.

92Day 1Open your ultrasound report and match today’s new baby skills: frowning, making faces, sucking its thumb, rolling over in the amniotic fluid. If a week-14 ultrasound happens to catch the face clearly, you’ll marvel that this little life already has a rich repertoire of expressions. Tuck the photo into your pregnancy diary with the date — to show the baby later: “This is the day you first made a face.”93Day 2Mark your “expected first fetal-movement date”: first-time mothers about weeks 18-22, and women who’ve given birth may feel it earlier at weeks 16-18. A few weeks away, so put a certain day in week 18 on the calendar as an expectation point. When it comes, lie quietly on your side for 20 minutes after a meal, hand on the lower abdomen — like a small fish bubbling, a butterfly flapping, or a very light intestinal movement — that’s it saying hello.94Day 3Walk 30 minutes today. At week 14 your energy is back and the belly isn’t yet big enough to restrict movement — the most comfortable exercise window of the second trimester. Choose a flat, quiet route, wear slip-resistant flat sports shoes, and pace so you “can still talk while walking without getting winded.” Put the phone away during the walk and focus on your breathing and step rhythm — both exercise and a moving meditation.95Day 4Book a dental check — weeks 14-27 are the safe window for dental care in pregnancy. Higher pregnancy estrogen makes about 60-75% of women develop pregnancy gingivitis (red, swollen, easily bleeding gums). If not cleaned and managed in time, plaque buildup can worsen gingivitis and even affect overall health. Tell the dentist you’re pregnant; they’ll choose safe cleaning and filling plans, avoid X-rays and be careful with medications.96Day 5Your abdominal skin is being stretched; apply moisturizing oil (olive oil, cocoa butter or a specialized stretch-mark cream) 1-2 times a day, warming it between your palms first, then stroking gently upward over the abdomen, sides, thighs and breasts. Don’t rub in circles or pull the skin. Do a few seconds of gentle stroking while applying — it’s also an intimate moment with your baby.97Day 6File your NT/early-screen/blood-test reports in order — paper copies in one folder, photos in the cloud or a pregnancy app. A doctor scanning a complete file is far more efficient than scattered sheets. Add each new check as you go; this complete record stays with you through the whole pregnancy to delivery.98Day 7Look into nearby prenatal-yoga or water-exercise classes. Mid-pregnancy is the best time to start — water buoyancy relieves back and joint pressure, and yoga trains breathing and the pelvic floor. Tell the instructor your week before the trial class to make sure it’s designed for the second trimester. Don’t chase intensity; focus on stretching, relaxing and breathing — and meeting a group of moms at the same stage is a bonus.

Week 14 belly changes

Illustration of belly changes at week 14: uterine position and abdominal prominence

At week 14 (second trimester) the uterus rises from the pelvis into the abdomen and most mums start to "show" — a gentle bump. First-time mums usually show a little later than mums who've been pregnant before; the fundal height sits between the navel and pubic bone.

Week 14 maternal body changes and common symptoms

  • The belly begins to protrude slightly as the uterus moves up from the pelvis into the abdomen
  • Energy clearly returns; normal work and exercise can resume
  • Round-ligament pain may occur — brief sharp pain on one or both sides of the lower abdomen, worse when changing position or coughing, relieved by rest
  • Appetite increases noticeably; this is the second-trimester weight-gain window
  • Nasal congestion or sinus fullness may occur (pregnancy rhinitis), affecting about 20-30% of women — estrogen makes the nasal lining swell. A humidifier and saline drops can help
  • Gums may bleed or swell (pregnancy gingivitis), affecting about 60-75% of women — pregnancy hormones make the gums more sensitive to plaque. Keep up the soft-bristle brush + floss and book a dental check
  • Hair may become fuller and glossier — high pregnancy estrogen lengthens the hair growth phase and reduces shedding
  • A little colostrum may ooze from the nipples (normal — don’t squeeze)

Week 14 nutrition advice and recommended recipes

About 340 extra calories a day (ACOG guideline) ≈ a glass of milk + an egg + a small handful of nuts. Gain about 0.4-0.5kg a week in the second trimester. Key supplements: ①zinc (oysters, lean meat, nuts) ②calcium (milk, soy products, sesame paste, about 1000mg a day) ③quality protein (fish, eggs, lean meat, about 70g a day) ④iron (red meat, liver, about 27mg a day) ⑤dietary fiber (whole grains, vegetables, legumes, about 25-30g a day) ⑥DHA (deep-sea fish 2-3 times a week or algae oil, 200-300mg a day, supporting fetal brain and retina development) ⑦iodine (iodized salt, seaweed/kelp, about 230μg a day). Avoid alcohol, cold-raw unpasteurized milk and high-mercury fish; caffeine ≤200mg/day. Taking zinc, iron and calcium at separate times absorbs better.

DHA200-300mgBrain & vision development
Recommended recipeOyster tofu soup + multigrain rice + dressed spinach

Oysters provide zinc, tofu provides calcium, multigrain rice adds B vitamins and fiber, and dressed spinach adds iron and folic acid — a fairly balanced, light and flavorful second-trimester meal. Note: oysters are high in purines; if uric acid is high or you have gout, switch to lean meat for zinc.

Week 14 prenatal education guide

First, to be clear: there is currently no strong evidence that specific stimulation makes a baby smarter; the core of prenatal care is helping the mother relax and feel good — going with the flow is best. On light stimulation: the traditional flashlight-on-the-belly practice has limited evidence; at week 14 the baby’s eyelids haven’t opened (they reopen only around weeks 26-28), so light can hardly reach the retina — no need to shine light deliberately. More reliable prenatal care — language: gently talk to your belly 5-10 minutes at a fixed time daily, reading picture books or recounting your day; this helps the mother relax and builds the bond — don’t chase “the baby remembering”; enjoy the process. Music: choose soothing classical music, natural white noise, or one fixed lullaby, keep the volume under 60 decibels, 15-20 minutes a day. Touch: lie flat and relaxed, gently circle-stroke the abdomen with both hands, slow and light, 5 minutes each time, which can be combined with language care.

Week 14 partner's role

① Make a pregnancy budget and shopping list with your partner: do homework on big items (crib, stroller, car seat) early. ② Accompany her to book a dental check — pregnancy gingivitis is common, and the second trimester is the safe treatment window. ③ Talk to the belly or sing the same song at a fixed time daily to build early parent-child connection; newborns show a stronger calming response to a father’s voice they heard repeatedly in pregnancy. ④ Help ease round-ligament pain: remind her to move slowly when changing position, and prepare a warm-water pack.

Week 14 checkup reminders

If you haven’t built your file yet, complete it before week 14 without fail. On Down’s/chromosome screening: the NT window is weeks 11-13⁺⁶; by exactly week 14 the NT timing has passed. You can preferably choose NIPT (cell-free DNA, generally doable from week 12, >99% detection for trisomy 21 and about 95-99% for trisomy 18, needing only a maternal blood draw with no miscarriage risk), or book the weeks 16-18 mid-trimester screen as the alternative. What the mid-term screen checks: a maternal blood draw measuring AFP, hCG, uE3 and Inhibin A to assess the risk of Down syndrome (trisomy 21), Edwards syndrome (trisomy 18) and neural-tube defects. Which screen to choose should combine age, NT result and your doctor’s advice.

Week 14 key concerns

Pregnancy purchase planning30 minutes of moderate-intensity exercise a day (ACOG recommends 150 minutes a week)Supplement zinc, calcium and ironBook the mid-trimester screenWatch for round-ligament pain

Signs that need immediate care at week 14

Contact your obstetrician or seek care promptly for any of the following: ①vaginal bleeding or brown discharge that doesn’t stop; ②sudden fluid gushing from the vagina (possible premature rupture of membranes); ③persistent or severe abdominal pain, with fever or regular contractions-like tightening; ④fever above 38°C that doesn’t come down; ⑤severe headache, blurred vision or severe upper-abdominal pain (be alert for pregnancy-induced hypertension — it mostly occurs after week 20 and is extremely rare before then, but must still be checked if it appears); ⑥painful urination, frequent/urgent urination or blood in the urine (urinary tract infection); ⑦swelling, heat or pain in one leg (be alert for a blood clot); ⑧sudden marked edema or a jump in weekly weight. Week 14 is relatively stable, but these “red-line” signs can’t be ignored.

Week 14 frequently asked questions

Can I swim in pregnancy?
Yes and it’s recommended. Water buoyancy relieves joint pressure. Choose a clean pool, water temperature 28-30°C, no more than 30 minutes each time.
Can I fly at week 14?
The second trimester is the best window for flying. Most airlines don’t require a doctor’s note before week 32, request one after week 32 (and mostly ban flying after week 36) — follow each airline’s rules. Choose an aisle seat to move around, drink plenty of water, and wear compression socks to prevent clots.
Are brief sharp pains in the lower abdomen normal?
Very common, usually round-ligament pain. As the uterus rises from the pelvis into the abdomen it pulls the round ligaments on both sides, causing brief single- or double-side lower-abdominal stabbing, worse when changing position, standing up fast, coughing or sneezing. Rest, change position slowly, and a warm pack helps. If the pain persists, or comes with bleeding or fever, seek care.
Is my belly feeling tight or hard at week 14 normal?
Occasional tightness or hardness at week 14 is mostly short episodes from increased uterine sensitivity or round-ligament pulling, usually passing on their own within seconds to tens of seconds and disappearing with rest or a position change — a common phenomenon. Distinguish: if the tightness becomes regular (like every 10 minutes), comes with pain, bleeding or fluid, it may not be mere sensitivity but something needing care — contact your doctor. Typical “practice contractions” (Braxton Hicks) become obvious mostly after week 20; at week 14 don’t match every symptom, but a tightness that won’t ease still deserves attention.
How big should my belly be at week 14?
First-time mothers at 14 weeks usually just start showing — the belly protrudes a little but may not show in clothing. Women who’ve given birth show earlier. The fundal height sits about 2-3 finger-widths above the pubic bone. Size varies by pre-pregnancy build, muscle tone and amniotic fluid. The doctor measuring fundal height at visits is the gold standard for growth — no need to compare with others.
Can I feel fetal movement at week 14?
First-time mothers usually first feel movement at weeks 18-22 (quickening); those who’ve given birth may feel it at weeks 16-18. At week 14 the baby is already very active in the amniotic fluid (somersaults, thumb-sucking) but is still small (about 43g) with plenty of cushioning, so the mother can’t feel it yet. Be patient — in a few more weeks comes one of the most exciting moments of pregnancy!
How many months pregnant am I at week 14?
By pregnancy-week reckoning, 14 weeks = a full 3 months, entering the 4th month. Medically, 4 weeks count as one pregnancy month, and 40 weeks ≈ 9 months and 10 days. Simple conversion: weeks ÷ 4 ≈ months, 14 ÷ 4 = 3.5 months. At this point you formally leave the first trimester (weeks 1-12) and enter the second (weeks 13-27) — the golden stage of returning energy and rapid fetal growth.
Do I need a flu shot in pregnancy?
The CDC and ACOG recommend all pregnant women get the inactivated flu vaccine; the second trimester is a safe vaccination window. Pregnant women have a higher risk of severe outcomes from flu, and the shot protects both mother and baby. The inactivated (not live) vaccine is safe at all stages — you can get it anytime during flu season (September to April).
Can I have a massage in pregnancy?
Yes; the second trimester (weeks 14-27) is the best window. Choose a therapist certified for prenatal massage, use the side-lying position (not face-down), avoid direct abdominal pressing and the acupuncture points near the ankles, and avoid deep leg massage (clot risk). Massage can relieve back pain, ease swelling and improve sleep.
Can I have sex at week 14?
In the second trimester (weeks 14-27) the fetus is relatively stable; as long as there is no low-lying placenta, bleeding, cervical insufficiency or threatened miscarriage as contraindications, sex is allowed. Choose positions that don’t press the abdomen (like side-lying), move gently and keep hygiene. If pain, bleeding or any discomfort occurs after sex, stop immediately and consult your doctor. If the placenta is low or your doctor advises avoidance, follow that.
What should I watch with sleep position at week 14?
From mid-pregnancy start practicing left-side sleeping — it increases uterine-placental blood flow, improves oxygen to the baby, and eases strain on the back and legs. A pregnancy pillow can support the abdomen and legs. You don’t have to stay on the left all night; comfort and good sleep matter most; a short time on your back or right side is fine — the key is avoiding face-down pressure on the belly.
How do I read my week-14 ultrasound report?
Week 14 ultrasound shows three common measures: BPD about 26mm (biparietal diameter — head width, reflecting brain development), AC about 78mm (abdominal circumference — reflecting nutrition absorption and liver development), and FL about 12mm (femur length — thigh bone, matching the week’s median). All three within the week-14 standard range indicates coordinated development. Take your obstetrician’s overall reading (also with NT and the Down’s screen) as authoritative; a single value slightly off isn’t necessarily abnormal.
What foods should I avoid at week 14?
Key avoidances: ①raw or undercooked meat/fish/eggs (toxoplasmosis and Listeria risk); ②high-mercury large fish (shark, swordfish, tilefish, bigeye tuna); ③unpasteurized dairy and raw-squeezed milk; ④alcohol (no amount is safe); ⑤caffeine over 200mg a day (about one medium americano); ⑥excess liver (vitamin A overdose). Well-cooked food, thorough heating, and choosing low-mercury fish and shrimp are safer.
How much weight gain is normal at week 14?
The second trimester (from week 14) enters steady weight gain; for a normal pre-pregnancy BMI, gain about 0.4-0.5kg a week, and cumulative gain by week 14 of about 2-5kg is common. Gain varies by person; single-week swings are affected by diet, swelling and bowel movements — watch the overall trend, not any one week. If too fast or too slow, talk to your doctor and consider using a pregnancy weight-gain calculator.
Is constipation at week 14 normal? How do I ease it?
Rising progesterone slows intestinal movement and the growing uterus presses the bowel, so constipation at week 14 is common. Relief: drink 1.5-2L of water a day, eat more whole grains, fruit and vegetables for fiber, walk after meals, and develop a regular toilet habit without sitting too long or straining. If severe, consult your doctor before using a pregnancy-safe laxative — don’t buy medicine on your own.
Are low-back ache and pelvic pain at week 14 normal?
In the second trimester relaxin loosens ligaments and joints and the pelvis bears more weight, so low-back ache or a dull pain in the pubic/pelvic area is common. Relief: avoid long standing or sitting, wear supportive low heels, place a pregnancy pillow between the legs when side-lying, and do moderate pelvic-floor exercises and prenatal yoga. If pain is severe, one-sided, or comes with bleeding or fever, seek care to rule out other problems.
Is more discharge at week 14 normal?
Rising estrogen increases vaginal discharge; milky-white or clear with no obvious smell is normal physiology. Watch for: discharge turning yellow-green, fishy odor, or vulvar itching/burning (suggesting infection), or a sudden large gush of watery fluid (be alert for premature rupture of membranes) — seek care if these occur. Wear cotton underwear, keep the vulva clean, and don’t do vaginal douching.
⚡The gestational-development data on this tool is compiled from the WHO INTERGROWTH-21st fetal growth standards, ACOG (American College of Obstetricians and Gynecologists), and the Chinese Medical Association's Guidelines for Pre-conception and Prenatal Care, and is reviewed for consistency by obstetrics consultants against those authoritative standards. Daily developmental tips, maternal changes, and nutrition advice follow an evidence-based approach. Note that fetal length is measured differently by week: crown–rump length (CRL) at or before week 20, and crown–heel length (CHL) from week 21 — values either side of week 21 are not directly comparable, which is a normal measurement change.

Data sources & notes

This tool provides algorithm-based estimates from the authoritative standards above for pregnancy time planning and general reference. It does not replace a doctor's diagnosis or individualized medical advice; follow your obstetrician for all prenatal care decisions.

Week 14 daily focus

Key daily tips for this week; tap any item to view the full development and guidance for that day.

Day 1Open your ultrasound report and match today’s new baby skills: frowning, making faces, sucking its thumb, rolling over in the amniotic fluid. If a week-14 ultrasound happens to catch the face clearly, you’ll marvel that this little life already has a rich repertoire of expressions. Tuck the photo into your pregnancy diary with the date — to show the baby later: “This is the day you first made a face.”Day 2Mark your “expected first fetal-movement date”: first-time mothers about weeks 18-22, and women who’ve given birth may feel it earlier at weeks 16-18. A few weeks away, so put a certain day in week 18 on the calendar as an expectation point. When it comes, lie quietly on your side for 20 minutes after a meal, hand on the lower abdomen — like a small fish bubbling, a butterfly flapping, or a very light intestinal movement — that’s it saying hello.Day 3Walk 30 minutes today. At week 14 your energy is back and the belly isn’t yet big enough to restrict movement — the most comfortable exercise window of the second trimester. Choose a flat, quiet route, wear slip-resistant flat sports shoes, and pace so you “can still talk while walking without getting winded.” Put the phone away during the walk and focus on your breathing and step rhythm — both exercise and a moving meditation.Day 4Book a dental check — weeks 14-27 are the safe window for dental care in pregnancy. Higher pregnancy estrogen makes about 60-75% of women develop pregnancy gingivitis (red, swollen, easily bleeding gums). If not cleaned and managed in time, plaque buildup can worsen gingivitis and even affect overall health. Tell the dentist you’re pregnant; they’ll choose safe cleaning and filling plans, avoid X-rays and be careful with medications.Day 5Your abdominal skin is being stretched; apply moisturizing oil (olive oil, cocoa butter or a specialized stretch-mark cream) 1-2 times a day, warming it between your palms first, then stroking gently upward over the abdomen, sides, thighs and breasts. Don’t rub in circles or pull the skin. Do a few seconds of gentle stroking while applying — it’s also an intimate moment with your baby.Day 6File your NT/early-screen/blood-test reports in order — paper copies in one folder, photos in the cloud or a pregnancy app. A doctor scanning a complete file is far more efficient than scattered sheets. Add each new check as you go; this complete record stays with you through the whole pregnancy to delivery.Day 7Look into nearby prenatal-yoga or water-exercise classes. Mid-pregnancy is the best time to start — water buoyancy relieves back and joint pressure, and yoga trains breathing and the pelvic floor. Tell the instructor your week before the trial class to make sure it’s designed for the second trimester. Don’t chase intensity; focus on stretching, relaxing and breathing — and meeting a group of moms at the same stage is a bonus.

Content sources & notes

This guide references WHO INTERGROWTH-21st standards, the China Prenatal & Pregnancy Care Guide, ACOG clinical guidelines and BabyCenter (medically reviewed).

This page is educational pregnancy information for general reference and does not replace the diagnosis or advice of a licensed healthcare provider.

View the full fetal BPD/AC/FL reference table (weeks 14–42) →

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