Week 11 · First trimester
EN
中文ZHहिन्दीHIBahasa IndonesiaIDPortuguêsPTРусскийRU日本語JAEspañolES

Week 11 fetal development and pregnancy guide — length about 4.1cm, weight 约7g (about the size of a an olive)

Your baby is now about 4.1cm and 约7g, about the size of a an olive.

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

View each day of week 11 →

Week 11 fetal development milestones: length / weight / ultrasound data

Key developmental changes during week 11:

  • The head is about half the body length; brain development is extremely rapid with massive neuronal growth
  • Taste buds begin forming — the baby can “taste” the flavor of the amniotic fluid (linked to the mother’s diet)
  • The intestines withdraw from the umbilical cord back into the abdomen, returning to their normal position
  • Tactile sense has developed in the fingers and toes, which respond to stimulation
  • The baby begins more involuntary activity, like stretching and fist-clenching
  • The outer-ear shape furthers, but hearing function still isn’t established
  • The kidneys keep producing urine, released into the amniotic cavity to participate in amniotic-fluid circulation
  • About 4.1cm — the size of a fig — weighing about 7g
Illustration of your baby about the size of an olive at week 11 (about 4.1cm/约7g)
Week 11 size: about the size of a an olive

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

Week 11 daily development

Your baby quietly grows every day of week 11. Tap any day to see fetal development, maternal changes, and daily guidance for that day.

71Day 1Confirm your NT appointment right away! Weeks 11-13⁺⁶ is the only window for the NT ultrasound + early screening; once missed it can’t be made up. Call the obstetrician this morning: confirm the appointment, whether a full bladder is needed (mostly not), and whether a fasting blood draw for early screening is needed in the same visit. If you’re over 35, also ask whether NIPT (cell-free DNA) should directly replace or supplement NT — know early and decide early.72Day 2Easing nausea is a good sign, but don’t overeat just because your appetite is back. Your gut is just released from morning sickness and hasn’t fully recovered digestively — overeating can easily trigger rebound heartburn. Treat yourself to what you want, but eat small, frequent portions (5-6 small meals a day) and stop around 70% full. Save the rest for the next meal — take it easy.73Day 3Have a cup of warm milk or plain yogurt (about 200-300ml) a day to lay the calcium foundation for the second-trimester bone need. Calcium needs rise to about 1000mg in mid-pregnancy — starting now is perfect: milk has about 100-120mg calcium per 100ml, and the vitamin D in an egg yolk helps absorption. If lactose-intolerant or milk upsets your stomach, switch to sugar-free yogurt, tofu, sesame paste or steamed egg with dried shrimp.74Day 4Spend ten minutes today checking your skincare and cosmetics: bottles with “retinol / retinoic acid,” “salicylic acid” or “hydroquinone” should be put away — they’re advised against in pregnancy. Sunscreen, basic moisturizer and amino-acid cleanser are fine; choose simply formulated, fragrance-free products. You can still wear makeup — light daily makeup without those ingredients is fine; skip heavy fragrance to be more comfortable.75Day 5Walk through home hazards with your partner: pad sharp table corners with corner protectors, make sure the bathroom has non-slip mats, and keep walkways free of cords or clutter that could trip you. Also think preliminarily about which room becomes the nursery — one close to the master bedroom, well ventilated and not cold in winter is best. No need to rush decorating or buying furniture, but note the space so future planning is easier.76Day 6The baby’s taste buds are forming on the tongue, and some of what you eat passes into the amniotic fluid, so it can already “taste” sweet, sour, bitter and spicy. This means — every natural food you eat today is helping build the baby’s first taste memories. Eat plenty of fresh vegetables, fruit and quality protein and cut back on over-sweet, over-salty processed snacks; your baby’s taste foundation will be healthier.77Day 7When your appetite is back, still don’t load up in one go. Pregnancy hormones slow intestinal movement and relax the sphincter, so eating too much not only fails to digest but causes bloating and heartburn. Splitting three meals into five or six and stopping each at 70-80% full is the most comfortable rhythm. If you want a snack, pick nuts, yogurt, fruit or whole-grain crackers instead of overlapping them with meals.

Week 11 belly changes

Illustration of belly changes at week 11: uterine position and abdominal prominence

At week 11 (first trimester) your uterus still sits low in the pelvis, so there is little visible change and your abdomen circumference barely moves. Don't worry if you don't "show" yet.

Week 11 maternal body changes and common symptoms

  • The uterus grows to about the size of a fist and begins moving up out of the pelvis
  • Nausea may start easing and appetite returning — about 60% of women see morning sickness clearly lessen after week 12, and 90% before week 20
  • Skin pigmentation may appear (melasma, darker areolas and abdominal midline); more than half of women have it
  • The breasts keep enlarging; more than half of women need more comfortable bras
  • Fatigue and dizziness may still occur, tied to rising blood volume and blood-pressure adjustment; some women have occasional palpitations
  • Constipation and bloating continue; about a third of women are bothered by pregnancy hormones slowing intestinal movement
  • Mood swings persist but often improve a little as morning sickness eases
  • Vaginal discharge may increase, usually normal — keep clean and choose cotton underwear

Week 11 nutrition advice and recommended recipes

From this week, gradually lay the foundation for the second trimester per authorities. Key nutrient targets: ①folic acid — ACOG recommends 400-800μg (0.4-0.8mg) daily and suggests continuing through the whole pregnancy; ②calcium — about 1000mg a day (ACOG) after mid-pregnancy; now have 300-500ml of milk or yogurt a day, plus soy products, dried shrimp and dark green vegetables; ③iodine — about 230μg a day in pregnancy, use iodized salt and have seaweed/kelp 1-2 times a week; ④DHA — about 200-300mg a day, from low-mercury fish 2-3 times a week or algae oil; ⑤quality protein — eggs, fish, lean meat and soy products, about 60-70g a day; ⑥vitamin D — get sun and eat egg yolks and mushrooms to aid calcium absorption (supplement as directed if sun is scarce); ⑦iron — about 27mg a day (ACOG) from the second trimester; get it from red meat, liver (≤50g/week) and spinach, paired with vitamin C; ⑧dietary fiber + water against constipation. As morning sickness eases and appetite returns, still don’t overeat — keep it balanced. Avoid alcohol, cold-raw unpasteurized milk and high-mercury fish; caffeine ≤200mg/day.

DHA200-300mgBrain & vision development
Recommended recipeSteamed egg custard with dried shrimp

Dried shrimp are high in calcium and eggs are soft quality protein — a two-for-one for calcium and protein, light and easy to digest. Mix the eggs with 1.5 times warm water, strain, sprinkle on dried shrimp, and steam over medium heat for 8 minutes; if lactose-intolerant, substitute some dairy calcium with sugar-free yogurt.

Week 11 prenatal education guide

At week 11 the baby still can’t hear (hearing develops after about week 16), so “reading stories and letting the baby get used to your voice” isn’t received by the baby yet. Don’t treat story prenatal care as teaching. What genuinely helps is: ①reading and talking warmly and calmly to relax the mother and build the parent-child bond; ②a regular routine and good mood to give the baby a safe intrauterine environment; ③staying away from tobacco, alcohol and harmful factors. Talking to your belly or reading picture books is of course fine — it’s what pleases you; no need for pressure.

Week 11 partner's role

①Go with your partner to the NT check, reminding her to have a lightly full bladder if needed (some people need it — follow the hospital) and relax; ②Record the NT result and the corrected due date into the prenatal file; ③Prepare comfortable maternity bras and help with dizziness (rise slowly, carry nuts to prevent low blood sugar); ④Keep quitting smoking, share chores, and plan the prenatal schedule together.

Week 11 checkup reminders

The NT ultrasound + early screening must be done from this week through week 13⁺⁶; once the window passes it generally can’t be made up — confirm it’s done or already booked. The result gives a chromosome-abnormality risk value; for high risk your doctor will suggest NIPT (cell-free DNA) or amniocentesis to confirm. This week also wraps up the first trimester; if you haven’t built your file yet, complete it soon (recommended weeks 8-12).

Week 11 key concerns

Complete or book the NT ultrasound + early screening (weeks 11-13⁺⁶)Begin calcium and vitamin DSun protection / prevent melasmaHome safety checkBalanced diet as appetite returns — don’t overeat

Signs that need immediate care at week 11

Please see a doctor promptly if any of the following occurs: ①vaginal bleeding (bright red or brown, light or heavy) with abdominal pain (be alert for threatened miscarriage); ②persistent severe pain on one side of the lower abdomen with bleeding or dizziness (be alert for ectopic pregnancy — even if late, still be careful); ③severe vomiting that keeps you from eating or drinking, with little dark urine (be alert for hyperemesis gravidarum); ④fever above 38°C with chills; ⑤severe headache or blurred vision; ⑥clearly abnormal vaginal discharge with odor or itching (be alert for infection); ⑦heavy gush of fluid from the vagina (be alert for premature rupture of membranes); ⑧sudden fainting or pale face.

Week 11 frequently asked questions

Is the NT test really necessary?
NT is one of the most important screening tests of early pregnancy. Measured on ultrasound as the thickness behind the fetal neck and combined with blood markers, it assesses chromosome-abnormality risk. It’s strongly recommended for all pregnant women within weeks 11-13⁺⁶; once that window passes it generally can’t be made up.
Do I need a full bladder for the NT test?
By weeks 11-13 the uterus has entered the abdominal cavity, so a full bladder is usually not needed — unless your doctor specifically asks. The test takes about 15-30 minutes; wear loose clothing that easily exposes the abdomen.
What NT value is normal? What if it’s on the higher side?
NT thickness varies with gestational age, and the doctor interprets it against the normal range for the corresponding week — it’s not one fixed cut-off like 3.0mm. A thicker NT only means higher risk, not necessarily a problem, and it can be transient. Your doctor will suggest NIPT (cell-free DNA) or amniocentesis to confirm — stay calm, follow professional advice, don’t judge on your own.
Are NT and the early screening the same thing at week 11?
NT is ultrasound measuring the nuchal translucency; the early screening (“early Down’s screen”) is a maternal blood test. They assess different things and are often combined for higher accuracy. Some hospitals arrange both in the same visit — follow your hospital’s process.
Can I do NIPT (cell-free DNA) at week 11?
NIPT is usually more accurate from week 12 onward (it needs enough fetal free DNA); some providers offer it from week 10. It’s especially recommended for older mothers, NT abnormalities or a history of chromosome problems. It has a high detection rate, but invasive diagnosis (amniocentesis) remains the gold standard — ask your doctor whether and when to do it.
Is it normal that nausea eases and appetite returns at week 11?
Yes. Most women see early-pregnancy reactions clearly ease after week 12, so easing from this week is a good sign. Once appetite returns, still don’t overeat — balanced nutrition and a controlled weight gain are better for both you and the baby.
How big is the uterus at week 11? Will I show?
The uterus is about the size of a fist and just moving from the pelvis up into the abdomen, so usually nothing shows yet; some women with looser abdominal muscles may show a little. The belly typically becomes visible around weeks 12-16 — no rush.
How can I prevent melasma and pigmentation at week 11?
Pregnancy hormones make pigmentation (cheek mask and a darker abdominal midline) more obvious. Use sun protection (physical sunscreen preferred), gentle skincare and enough sleep; most of it fades after childbirth. If a patch darkens or spreads rapidly, mention it to your doctor at a prenatal visit.
Can I have sex at week 11?
If there is no bleeding, abdominal pain, history of miscarriage, or low-lying placenta as a contraindication, gentle sex is usually fine — move carefully and avoid pressure on the abdomen. If you feel unwell or your doctor advises against it, pause.
What about constipation and bloating at week 11?
Eat more whole grains, fruit and vegetables for fiber, drink 1.5-2L of water a day, walk after meals, and develop a regular toilet habit. If severe, don’t buy irritant laxatives on your own — ask a doctor for a pregnancy-safe laxative (like lactulose).
Can I exercise and work at week 11?
Yes — you can work normally and do walking, prenatal yoga and other gentle exercise, while avoiding prolonged standing, overexertion, heavy lifting and high-risk activities. If your work involves radiation, chemicals or too much stress, discuss adjustments with your doctor and employer.
Can I fly at week 11?
If there are no complications, traveling in early pregnancy is usually fine; move around often, drink water to prevent blood clots, and place the seatbelt under the abdomen. If you have bleeding, pain, or a history of miscarriage, consult your doctor before traveling.
Is vaginal bleeding at week 11 serious?
Bleeding at any week of pregnancy warrants evaluation. Small amounts of brown discharge with a sensitive cervix can be observed first, but bright red, increased bleeding or bleeding with pain needs immediate care to rule out issues like threatened miscarriage.
How many months pregnant am I at week 11? How big is the baby?
Week 11 is over 2 months, nearing 3; still early pregnancy. The baby is about 4.1cm, like a fig, with taste buds forming, but the belly is not visibly showing.
Can I drink coffee or milk tea at week 11?
A little is okay, but keep caffeine ≤200mg/day (about one medium americano or two cups of weak tea). Milk tea is high in sugar and trans fats, so limit it. Avoid alcohol entirely.
Can I take medicine for a cold or fever at week 11?
Do not self-medicate. Rest and drink plenty of fluids; if fever is above 38°C or symptoms are obvious, see a doctor promptly and tell them you are pregnant so they can choose relatively safe medications.
How much weight should I gain at week 11?
In early pregnancy weight mostly stays level or rises slightly; it may even drop a little with heavy morning sickness — all normal. From the second trimester expect about 0.4-0.5kg a week (for a standard BMI). Use a pregnancy weight-gain calculator to manage within the range for your pre-pregnancy BMI — don’t overfeed in early pregnancy.
Should I start calcium at week 11?
You can start getting calcium from milk, yogurt and soy products and preparing for the second trimester (about 1000mg a day). Whether to take tablets depends on dietary intake; supplement as your doctor directs if a check shows you’re low — don’t stock up blindly.
What signs might twins show at week 11?
Twins often have higher HCG, stronger morning sickness and a larger uterus, but all need ultrasound to confirm. If you’ve only seen one sac or one heartbeat, it’s usually a single pregnancy.
Can I eat on the day of the NT test at week 11?
NT is an ultrasound, so you generally don’t need to fast and can eat normally; if the same visit includes a blood draw for early screening or other fasting test, the hospital will tell you in advance — prepare as directed.
Is there a recommended amount of exercise for pregnancy?
Yes. ACOG recommends about 150 minutes of moderate-intensity activity per week (walking, prenatal yoga, etc.) for pregnant women without complications, split over 5 days at about 30 minutes each. As morning sickness eases at week 11, gradually resume; avoid strenuous activity and abdominal pressure — stop and seek care if pain or bleeding occurs.
Should I get a flu shot in pregnancy?
Yes, recommended. The CDC and ACOG both recommend the inactivated flu vaccine for pregnant women — pregnant women have a higher risk of severe outcomes, the vaccine protects both mother and baby, and it is safe at all stages. You can get it during flu season (roughly September-April); tell the vaccinator you are pregnant.
How much calcium do I need daily in pregnancy?
ACOG recommends about 1000mg of calcium a day from the second trimester. Prioritize milk, yogurt, soy products, dried shrimp and dark green vegetables. If a check shows insufficient intake or obvious leg cramps, add calcium tablets as directed — don’t take large doses blindly (they may worsen constipation or affect iron/zinc absorption).
⚡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 11 daily focus

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

Day 1Confirm your NT appointment right away! Weeks 11-13⁺⁶ is the only window for the NT ultrasound + early screening; once missed it can’t be made up. Call the obstetrician this morning: confirm the appointment, whether a full bladder is needed (mostly not), and whether a fasting blood draw for early screening is needed in the same visit. If you’re over 35, also ask whether NIPT (cell-free DNA) should directly replace or supplement NT — know early and decide early.Day 2Easing nausea is a good sign, but don’t overeat just because your appetite is back. Your gut is just released from morning sickness and hasn’t fully recovered digestively — overeating can easily trigger rebound heartburn. Treat yourself to what you want, but eat small, frequent portions (5-6 small meals a day) and stop around 70% full. Save the rest for the next meal — take it easy.Day 3Have a cup of warm milk or plain yogurt (about 200-300ml) a day to lay the calcium foundation for the second-trimester bone need. Calcium needs rise to about 1000mg in mid-pregnancy — starting now is perfect: milk has about 100-120mg calcium per 100ml, and the vitamin D in an egg yolk helps absorption. If lactose-intolerant or milk upsets your stomach, switch to sugar-free yogurt, tofu, sesame paste or steamed egg with dried shrimp.Day 4Spend ten minutes today checking your skincare and cosmetics: bottles with “retinol / retinoic acid,” “salicylic acid” or “hydroquinone” should be put away — they’re advised against in pregnancy. Sunscreen, basic moisturizer and amino-acid cleanser are fine; choose simply formulated, fragrance-free products. You can still wear makeup — light daily makeup without those ingredients is fine; skip heavy fragrance to be more comfortable.Day 5Walk through home hazards with your partner: pad sharp table corners with corner protectors, make sure the bathroom has non-slip mats, and keep walkways free of cords or clutter that could trip you. Also think preliminarily about which room becomes the nursery — one close to the master bedroom, well ventilated and not cold in winter is best. No need to rush decorating or buying furniture, but note the space so future planning is easier.Day 6The baby’s taste buds are forming on the tongue, and some of what you eat passes into the amniotic fluid, so it can already “taste” sweet, sour, bitter and spicy. This means — every natural food you eat today is helping build the baby’s first taste memories. Eat plenty of fresh vegetables, fruit and quality protein and cut back on over-sweet, over-salty processed snacks; your baby’s taste foundation will be healthier.Day 7When your appetite is back, still don’t load up in one go. Pregnancy hormones slow intestinal movement and relax the sphincter, so eating too much not only fails to digest but causes bloating and heartburn. Splitting three meals into five or six and stopping each at 70-80% full is the most comfortable rhythm. If you want a snack, pick nuts, yogurt, fruit or whole-grain crackers instead of overlapping them with meals.

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) →

Related pregnancy tools

Pregnancy Weight Gain CalculatorCheck whether this week's gain is within a healthy rangeBMI CalculatorLearn your pre-pregnancy BMI and pregnancy adviceSafe Period CalculatorTrack your cycle to plan conception and contraceptionPregnancy CalculatorEnter your last period to see your exact week