Day 73 baby development and maternal changes
Today your baby weighs about about 9g and is about about 4.5cm, the size of a an olive (week 11). (weeks up to 20 use crown-rump length CRL; from week 21 head-to-heel CHL; the two are not directly comparable).Learn the full BPD/AC/FL reference table for weeks 14–42 →
Today's key focus
Have 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.
What your baby is doing today
The bowel loop withdraws from the umbilical cord back into the abdominal cavity, returning to its normal position.
Pregnancy progress
Day 73 / about 280 days. Progress 26%
Note: today's weight and length are linearly interpolated between week 11 and week 12 data for general reference.
This week (week 11) development overview
🍓 This week's size: an olive
- 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
This week's key concerns
Maternal body changes this week
- 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
Nutrition advice this week
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.
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.
Prenatal education this week
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.
Partner's tasks this week
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.
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).
Signs that need immediate care
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
Q: Is the NT test really necessary?
A: 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.
Q: Do I need a full bladder for the NT test?
A: 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.
Q: What NT value is normal? What if it’s on the higher side?
A: 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.
Q: Are NT and the early screening the same thing at week 11?
A: 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.
Q: Can I do NIPT (cell-free DNA) at week 11?
A: 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.
Q: Is it normal that nausea eases and appetite returns at week 11?
A: 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.
Q: How big is the uterus at week 11? Will I show?
A: 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.
Q: How can I prevent melasma and pigmentation at week 11?
A: 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.
Q: Can I have sex at week 11?
A: 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.
Q: What about constipation and bloating at week 11?
A: 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).
Q: Can I exercise and work at week 11?
A: 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.
Q: Can I fly at week 11?
A: 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.
Q: Is vaginal bleeding at week 11 serious?
A: 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.
Q: How many months pregnant am I at week 11? How big is the baby?
A: 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.
Q: Can I drink coffee or milk tea at week 11?
A: 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.
Q: Can I take medicine for a cold or fever at week 11?
A: 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.
Q: How much weight should I gain at week 11?
A: 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.
Q: Should I start calcium at week 11?
A: 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.
Q: What signs might twins show at week 11?
A: 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.
Q: Can I eat on the day of the NT test at week 11?
A: 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.
Q: Is there a recommended amount of exercise for pregnancy?
A: 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.
Q: Should I get a flu shot in pregnancy?
A: 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.
Q: How much calcium do I need daily in pregnancy?
A: 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).
Data sources & notes
- Guidelines for Pre-conception and Prenatal Care (Chinese Society of Obstetrics and Gynecology)
- ACOG Methods for Estimating the Due Date (Committee Opinion No.700)
- WHO INTERGROWTH-21st fetal growth standards
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.
View the full fetal BPD/AC/FL reference table (weeks 14–42) →
Data note: BPD, AC, and FL reference values follow the median and 3rd–97th percentile ranges of the Expert Consensus on Fetal Biometric Ultrasound Reference Values (2024). For pregnancy education and everyday reference only; does not replace professional ultrasound diagnosis. When shown, today's weight/length are interpolated estimates from week-to-week data.