Week 35 · Third trimester
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Week 35 fetal development and pregnancy guide — length about 46.2cm, weight 约2383g (about the size of a a honeydew melon)

Your baby is now about 46.2cm and 约2383g, about the size of a a honeydew melon.

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

View each day of week 35 →

Week 35 fetal development milestones: length / weight / ultrasound data

Key developmental changes during week 35:

  • Kidney function is basically mature and the liver begins to handle metabolic waste.
  • Most babies have a fixed fetal position and no longer turn much.
  • Body fat continues to increase rapidly, about 12%-15% of weight.
  • In a male baby the testicles have basically completed their descent into the scrotum (if not fully descended at birth, a paediatrician assesses and manages it).
  • Subcutaneous fat is thick and the body is full and plump.
  • The lungs are mature and can breathe on their own.
  • The myelination of the brain’s white matter advances, making neural signalling more efficient.
  • The immune system obtains large amounts of antibodies (IgG) from the mother, making early protection more stable.
  • The fetal-movement active periods are fixed.
  • The nails have grown past the fingertips.
  • About 46.2cm long, about the size of a honeydew melon, weighing about 2383g.
Illustration of your baby about the size of a honeydew melon at week 35 (about 46.2cm/约2383g)
Week 35 size: about the size of a a honeydew melon
BPD (biparietal diameter)86.8mmWidth across the head; reflects brain development
AC (abdominal circumference)309mmAbdomen circumference; reflects nutrient absorption
FL (femur length)65mmThigh bone length; tracks gestational age
Ultrasound parameters at week 35: BPD 86.8 mm, AC 309 mm, FL 65 mm (median reference)
Week 35 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 35 daily development

Your baby quietly grows every day of week 35. Tap any day to see fetal development, maternal changes, and daily guidance for that day.

239Day 1Most of the baby’s organ systems have entered an "out-of-the-factory preparation" state — the kidneys can independently filter waste, the liver begins handling metabolic waste, and the immune system has taken up large amounts of antibodies from you. From now to birth the focus of growth shifts from "organ formation" to "fat storage and neural maturation" — every meal you eat contributes to its "birth weight".240Day 2Write the baby a "welcome letter" — it doesn’t have to be well-written, just the three sentences you most want to say: "Baby, Mum and Dad want to tell you we’ve been here waiting for you almost 9 months", "There are lots of interesting things in this world we want to take you to see", "Grow slowly, we won’t rush you". Fold the letter into the hospital bag; after the birth read it to the baby or wait until its first birthday — this letter is a parent-child bond that crosses time.241Day 3The GBS screen (group-B streptococcus test) is this or next week — the doctor takes samples from the vagina and rectum with cotton swabs, taking under 20 seconds. About 10-30% of healthy women carry this bacterium with no symptoms; passing it to the baby through the birth canal at delivery can cause pneumonia or meningitis — if positive, intravenous antibiotics during labour effectively prevent about 80% of infections without affecting a vaginal birth.242Day 4Dad-to-be, confirm three things today: ①the number of paternity-leave days (varies by region, most commonly 15 days — confirm in writing with HR in advance); ②who the work handover contact is in case the baby arrives early; ③who — the confinement nanny or family — takes charge of the main care in the first days after birth, to avoid the "who takes care of the baby" chaos after discharge. Write the three answers in your phone notes; you are not going to the battlefield alone.243Day 5The baby may start engaging — breathing feels a little easier than before (the diaphragm is released), but urination roughly doubles (the head presses the bladder), walking becomes a "duck waddle" (the pelvis opens), and there is a dull ache in the pubic bone and upper thigh. Engaging doesn’t mean birth is imminent — a first-time mum may engage 2-4 weeks early (about 36-38 weeks), while a mother of a previous child may engage in labour itself. Don’t worry about the head position; your prenatal doctor will tell you.244Day 6Make steamed cod for dinner tonight — cod is a low-mercury, high-DHA ideal pregnancy fish, and steaming preserves the most omega-3. Steam cod chunks with ginger shreds for 8 minutes → pour off the released watery liquid → drizzle a little steamed-fish soy sauce and hot scallion oil. Serve with a bowl of multigrain rice and garlic broccoli for a complete, balanced late-pregnancy dinner.245Day 7A guide to body changes after the baby engages: ①breathing eases — the uterus moves down a few centimetres and the diaphragm is no longer blocked; ②urination worsens — the baby’s head sits like a solid ball on the bladder, squeezing its capacity down to next to nothing; ③the pubic bone and groin feel sore — the pelvic ligaments and pubic symphysis open further under relaxin. All of this is normal — ease it with a belly-support belt, slow walking and extra seated rest.

Week 35 belly changes

Illustration of belly changes at week 35: uterine position and abdominal prominence

At week 35 (third trimester) the uterine fundus keeps rising closer to the sternum. Your belly is clearly rounded and your waistline and fundal height grow quickly, so pay more attention to balance and safety in daily movement.

Week 35 maternal body changes and common symptoms

  • The uterine fundus starts to drop slightly (the baby may be engaging), and breathing feels a little easier.
  • Cumulative weight gain is about 11.5-15.5kg (about 0.4-0.5kg a week in the third trimester for a standard BMI).
  • Pelvic pressure increases, the walking posture changes ("duck waddle") and frequent urination may worsen.
  • Bloating, heartburn and constipation may persist.
  • Leg swelling, cramps and varicose veins may become more obvious.
  • Sleep difficulty and lower-back or pubic-bone pain may worsen.
  • Itchy abdominal skin, stretch marks, urine leaking, and many Braxton Hicks false contractions.
  • The breasts enlarge and colostrum is secreted.

Week 35 nutrition advice and recommended recipes

GDM mothers should keep controlling sugar, monitoring blood sugar and eating by the nutrition-department plan; if the doctor judges that GDM placental ageing is faster, induction around weeks 39-40 may be recommended — just follow the doctor. Ordinary pregnant mums should also keep a balanced diet. Daily targets: quality protein about 80-90g, iron about 27-29mg, calcium 1000mg, DHA 200-300mg, fiber 25-30g, iodine 230μg. Avoid alcohol, raw or unpasteurised milk products, high-mercury fish, caffeine ≤200mg a day.

DHA200-300mgBrain & vision development
Recommended recipeSteamed cod

Cod is low-fat, high in protein, rich in DHA and low in mercury; steamed to keep its natural flavour and ease of digestion, it suits the third trimester, especially for GDM mums. Make sure the fish is fully cooked and free of bones; eat in moderation if you have gout.

Week 35 prenatal education guide

The core of "fetal education" is still to help the mother-to-be relax and go with the flow; there is no strong evidence that any specific stimulation makes the baby smarter. This week use a "delivery ritual" to relax yourself: write a "welcome letter" to your baby with your expectations, blessings and love — a precious family keepsake that helps you sort through your feelings and stay cheerful; its value lies in caring for your own mood, not "teaching" the baby anything. What you can do: talk gently 5-10 minutes at a set time daily, combined with gentle stroking; choose soothing music to relax.

Week 35 partner's role

①Arrange paternity leave (generally 15 days by law, varying by region) and communicate with the company ahead of time. ②Finalise the post-natal-carer and family division of labour, clarifying who will care for mum and baby after birth. ③Talk or sing close to the belly at a set time daily to build a father’s voice the baby recognises. ④Help relieve pelvic pressure: remind her to walk slowly, use a belly-support belt, side-sleep with a pregnancy pillow and soak her feet in warm water.

Week 35 checkup reminders

Weeks 35-37: GBS (group-B streptococcus) screening (vaginal + rectal swabs; if positive, intravenous antibiotics during delivery prevent newborn infection). Routine visits remain every two weeks (weekly after 36), continuing NST fetal-heart monitoring and daily fetal-movement counting. This week you can confirm that the Tdap vaccine has been given (window weeks 27-36).

Week 35 key concerns

GBS screening (35-37 weeks)Arrange paternity leaveWatch for engagementConfirm postpartum-confinement-care arrangements30 minutes of moderate exercise daily (ACOG recommends 150 minutes a week across pregnancy)

Signs that need immediate care at week 35

If any of the following occurs, contact your obstetrician or seek medical help promptly: ① fetal movements drop by more than 50% or fewer than 10 in 2 hours → this can be a signal of placental insufficiency, seek care immediately; ② regular contractions (interval 5-10 minutes, increasingly frequent and strong); ③ sudden leakage of fluid from the vagina (suspected preterm rupture of membranes); ④ persistent severe headache, blurred vision or severe upper-abdominal pain with raised blood pressure or sudden oedema (watch for preeclampsia); ⑤ itching all over, especially the palms and soles with no rash (watch for ICP); ⑥ a fever over 38℃ that does not come down; ⑦ one leg swollen, hot and painful, or sudden breathlessness and chest pain (watch for a clot/pulmonary embolism); ⑧ a large amount of bright-red vaginal bleeding (watch for placenta praevia).

Week 35 frequently asked questions

What should I do if GBS is positive?
GBS (group-B streptococcus) is a common colonising bacterium and does not mean there is an infection. Intravenous antibiotics during labour effectively prevent about 80% of newborn infections and do not affect a vaginal birth. Screening is usually arranged at weeks 35-37; if positive, the baby is simply observed more after birth.
How much weight gain is normal at week 35?
A cumulative gain of about 11.5-15.5kg by week 35 is common. In the third trimester a standard-BMI mum gains about 0.4-0.5kg a week, with about 11.5-16kg recommended across the whole pregnancy. Watch the overall trend — use a weight-gain calculator to manage by BMI.
Has the baby engaged at week 35?
Some babies engage this week, the uterine fundus drops slightly and breathing eases, but first-time mums may do so later (engaging only close to labour) while mothers of a previous child may engage during labour itself. Whether the baby has engaged doesn’t mean labour is imminent — go by the prenatal assessment.
Must GDM mothers necessarily be induced at 39-40 weeks?
Not absolutely. If sugar control is good and the baby and placenta are assessed as normal, natural onset can be awaited; if sugar is poorly controlled, the placenta ages faster or the baby is large, the doctor may suggest induction around 39-40 weeks. The decision is made by comprehensive medical assessment.
How to read the week-35 ultrasound report?
The three measurements at 35 weeks: BPD (biparietal diameter) about 86.8mm, AC (abdominal circumference) about 309.0mm, and FL (femur length) about 65.0mm, reflecting head, abdomen and leg development respectively. If the three are in step, growth is good; a single slight deviation isn’t necessarily abnormal — go by your obstetrician’s overall assessment.
Is fetal movement regular at week 35?
Most babies have clear active periods, and once the position is fixed the amplitude changes. Since week 28, count fetal movements daily: one hour morning, noon and evening, with ≥10 in 2 hours normal; if it is clearly under 10 in 2 hours or less than half the usual, seek care immediately.
Is heavy pelvic pressure and a duck-like waddle normal at week 35?
The baby engaging and relaxin relaxing the pelvic joints makes pelvic pressure and a changed walking posture common. A belly-support belt, low supportive shoes, side-sleeping with a pregnancy pillow and avoiding long standing can help; see a doctor if the pain affects walking or comes with bleeding.
Is there a recommended exercise duration in pregnancy?
ACOG recommends about 150 minutes of moderate-intensity exercise accumulated weekly for women without complications (walking, prenatal yoga, swimming), split over 5 days at about 30 minutes a day. In the third trimester favour walking and stretching, avoiding intense exercise and pressure on the abdomen; stop and seek care for abdominal pain or bleeding.
Do I still need vaccinations in late pregnancy?
The CDC and ACOG recommend the Tdap (pertussis) vaccine at weeks 27-36 to protect the baby from whooping cough; the inactivated flu vaccine can also be given in flu season — both are pregnancy-safe, and this week is still within the window, so tell the provider you are pregnant before vaccination.
Can I have sex at week 35?
With no placenta praevia, bleeding, cervical insufficiency or threatened preterm labour, gentle sex is fine using positions that don’t press on the belly and with gentle movements. The closer to the due date, the more cautious — pause if you feel unwell or the doctor advises against it; see a doctor for bleeding, pain or fluid leakage after sex.
What about leg cramps and oedema at week 35?
For a cramp, flex the foot and massage the calf; prevention centres on calcium and magnesium, drinking water and stretching before bed. For oedema, raise your legs, lie on your left side, walk to promote return flow and moderately limit salt. If the swelling suddenly worsens, spreads to the face and hands or comes with headache/vision changes, check blood pressure to rule out preeclampsia.
What should I avoid eating at week 35?
Avoid raw or undercooked meat, fish and eggs, high-mercury large fish, unpasteurised dairy, alcohol, caffeine up to 200mg a day, and excess animal liver. GDM mums must also strictly control refined sugar and sugary drinks.
What about heartburn and bloating at week 35?
Eat small frequent meals, chew slowly, stay sitting 30 minutes after a meal before lying down, don’t eat within 2-3 hours before bed, avoid spicy, greasy, overly sweet food and fizzy drinks, and prop up the upper body when sleeping. In severe cases use a pregnancy-safe antacid under a doctor’s guidance.
What about constipation and haemorrhoids at week 35?
Eat more coarse grains, fruit and vegetables for fiber, drink 1.5-2L of water daily, walk after meals, and toilet on a regular schedule without squatting long; warm-water sitz baths help haemorrhoids. Iron supplements can worsen constipation — discuss adjusting them with your doctor; in serious cases choose a pregnancy-safe medication and don’t buy a stimulant laxative yourself.
What about lower-back and pubic-bone pain at week 35?
It comes from the forward centre of gravity and relaxin loosening the ligaments and pelvic joints. Avoid long standing or sitting, wear supportive low shoes, use a belly-support belt, side-sleep with a pregnancy pillow, do prenatal yoga and pelvic-floor exercises and apply local heat. Sharp pain on one side, or with bleeding or fever, needs medical care.
Can’t sleep well at week 35?
The growing abdomen, frequent urination and difficulty turning over affect sleep. Use a pregnancy pillow for support, side-sleep, soak your feet before bed to relax, drink less water after evening to cut night urination, and exercise moderately in the day. Avoid screens and caffeinated drinks before bed.
Are frequent false contractions at week 35 normal?
Frequent false contractions in late pregnancy are fairly common: brief tightening of the abdomen that is painless, irregular and resolves with rest. If they become regular, painful or come with lumbar aches and heaviness, seek care to rule out preterm labour.
What should the hospital bag contain?
Three categories: maternal items (postnatal pads, nursing bra, toiletries), baby items (NB nappies, swaddling, going-home clothes) and documents (ID card, social-security card, prenatal record). Once packed, keep it at the door for a quick departure.
How many days of paternity leave are there usually?
Nationally, paternity (nursing) leave is set by each region, generally around 7-30 days (often about 15 days), according to the local family-planning regulations. Confirm and submit the request with your company HR in advance.
⚡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 35 daily focus

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

Day 1Most of the baby’s organ systems have entered an "out-of-the-factory preparation" state — the kidneys can independently filter waste, the liver begins handling metabolic waste, and the immune system has taken up large amounts of antibodies from you. From now to birth the focus of growth shifts from "organ formation" to "fat storage and neural maturation" — every meal you eat contributes to its "birth weight".Day 2Write the baby a "welcome letter" — it doesn’t have to be well-written, just the three sentences you most want to say: "Baby, Mum and Dad want to tell you we’ve been here waiting for you almost 9 months", "There are lots of interesting things in this world we want to take you to see", "Grow slowly, we won’t rush you". Fold the letter into the hospital bag; after the birth read it to the baby or wait until its first birthday — this letter is a parent-child bond that crosses time.Day 3The GBS screen (group-B streptococcus test) is this or next week — the doctor takes samples from the vagina and rectum with cotton swabs, taking under 20 seconds. About 10-30% of healthy women carry this bacterium with no symptoms; passing it to the baby through the birth canal at delivery can cause pneumonia or meningitis — if positive, intravenous antibiotics during labour effectively prevent about 80% of infections without affecting a vaginal birth.Day 4Dad-to-be, confirm three things today: ①the number of paternity-leave days (varies by region, most commonly 15 days — confirm in writing with HR in advance); ②who the work handover contact is in case the baby arrives early; ③who — the confinement nanny or family — takes charge of the main care in the first days after birth, to avoid the "who takes care of the baby" chaos after discharge. Write the three answers in your phone notes; you are not going to the battlefield alone.Day 5The baby may start engaging — breathing feels a little easier than before (the diaphragm is released), but urination roughly doubles (the head presses the bladder), walking becomes a "duck waddle" (the pelvis opens), and there is a dull ache in the pubic bone and upper thigh. Engaging doesn’t mean birth is imminent — a first-time mum may engage 2-4 weeks early (about 36-38 weeks), while a mother of a previous child may engage in labour itself. Don’t worry about the head position; your prenatal doctor will tell you.Day 6Make steamed cod for dinner tonight — cod is a low-mercury, high-DHA ideal pregnancy fish, and steaming preserves the most omega-3. Steam cod chunks with ginger shreds for 8 minutes → pour off the released watery liquid → drizzle a little steamed-fish soy sauce and hot scallion oil. Serve with a bowl of multigrain rice and garlic broccoli for a complete, balanced late-pregnancy dinner.Day 7A guide to body changes after the baby engages: ①breathing eases — the uterus moves down a few centimetres and the diaphragm is no longer blocked; ②urination worsens — the baby’s head sits like a solid ball on the bladder, squeezing its capacity down to next to nothing; ③the pubic bone and groin feel sore — the pelvic ligaments and pubic symphysis open further under relaxin. All of this is normal — ease it with a belly-support belt, slow walking and extra seated rest.

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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