Day 190 baby development and maternal changes
Today your baby weighs about about 1005g and is about about 37.6cm, the size of a a large eggplant (week 28). (weeks up to 20 use crown-rump length CRL; from week 21 head-to-heel CHL; the two are not directly comparable).BPD about 70.6mm (standard 64.4–77.3), femur length about 51.2mm, abdominal circumference about 236.1mm (reference range see each index). A single reading within the standard range is normal variation; your obstetrician's overall assessment prevails.Learn the full BPD/AC/FL reference table for weeks 14–42 →
Today's key focus
You officially enter the third trimester! From today prenatal visits change from monthly to every two weeks, and set alarm reminders on your phone for two days and one day before each visit. The third trimester is the key monitoring period for gestational hypertension, preeclampsia and fetal growth restriction; the two-weekly visit frequency exists precisely to "err on the side of coming more often rather than missing a case". Save your maternity hospital’s phone number in your contacts and star it.
What your baby is doing today
The brain develops rapidly: the sulci and gyri deepen, the brain weight grows quickly (about 350-400g at birth), and the neural connections increase greatly.
Pregnancy progress
Day 190 / about 280 days. Progress 68%
Note: today's weight and length are linearly interpolated between week 28 and week 29 data for general reference.
This week (week 28) development overview
🍓 This week's size: a large eggplant
- The brain develops rapidly: the sulci and gyri deepen, the brain weight grows quickly (about 350-400g at birth), and the neural connections increase greatly.
- Hearing, smell and touch are all mature and functional.
- The central nervous system begins to regulate body temperature, manage rhythmic breathing movements and strengthen the lungs.
- The bone marrow gradually takes over from the liver as the main blood-making organ (red blood cells are mainly produced by the bone marrow).
- The intestines lengthen and coil within the abdominal cavity, and the digestive layout is formed.
- The eyelashes have grown, and the baby blinks at light through the abdominal wall.
- Fat keeps accumulating, the limbs and cheeks grow rounder, and the body proportions are more balanced.
- Fetal movements are strong and can be seen from outside the belly; most babies gradually turn to a head-down position between weeks 28-36.
- About 37.6cm long, about the length of a big eggplant, weighing about 1005g (already over 1kg).
This week's key concerns
Maternal body changes this week
- You enter the third trimester! Prenatal visits change from monthly to every two weeks.
- Start counting fetal movements every day — an important way to monitor your baby’s wellbeing.
- Fetal movements are strong and forceful — you may see the belly pushed up.
- The uterine fundus is about 8cm above the navel.
- Cumulative weight gain is about 8-11kg (about 0.4-0.5kg a week in the third trimester).
- Leg swelling, varicose veins or haemorrhoids may appear.
- Shortness of breath, heartburn and lower-back pain may worsen.
- The breasts enlarge, colostrum is secreted, and Braxton Hicks contractions may appear.
Nutrition advice this week
In the third trimester iron needs rise further (the Chinese Nutrition Society recommends about 29mg a day in late pregnancy, ACOG about 27mg). Prevent and correct late-pregnancy anaemia: give priority to haem iron — red meat, animal liver (≤50g a week), animal blood — paired with vitamin C produce to improve absorption; black fungus, seaweed and red beans also contain iron. Don’t take iron with strong tea, coffee or milk (tannins and calcium interfere with iron absorption). Daily targets: iron about 27-29mg, quality protein about 80-85g, calcium 1000mg, DHA 200-300mg, fiber 25-30g, iodine 230μg. Avoid alcohol, raw or unpasteurised milk products, high-mercury fish, caffeine ≤200mg a day.
Red beans replenish iron and help diuresis, and black rice supplements iron and contains anthocyanins; simmered slowly until soft and easy to digest, it suits late-pregnancy iron supplementation and helping reduce swelling. If your blood sugar runs high, control the portion and eat it with protein and nuts to slow the blood-sugar rise.
Prenatal education this week
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. In the third trimester the baby’s hearing is keen with a clear routine, so you can do a simple daily "fetal-education package" during the baby’s awake and active periods: stroke the belly 5 minutes → play soothing music 5 minutes → talk gently or read a picture book 5 minutes → deep-breathing relaxation 5 minutes, about 20 minutes in total (a torch on the belly for "light fetal education" is not recommended — no proven benefit and it may disturb the baby). The key is to be regular, gentle, and relaxing for both of you — don’t chase a "training" effect.
Partner's tasks this week
①Enter the "antenatal training camp": learn the three stages of labour and the Lamaze breathing technique with your partner, understand the procedures and indications for natural and caesarean delivery, and be ready to accompany in the labour ward. ②Count fetal movements with your partner: accompany her to quietly record at the same time slots morning, noon and evening. ③Help boost iron: prepare high-iron meals such as red meat and animal liver (≤50g a week), and remind her not to take iron with strong tea or coffee. ④Help relieve swelling: raise her legs, soak her feet in warm water and gently massage her feet.
Checkup reminders
Week 28 begins the third trimester: prenatal visits change to every two weeks. This week is a routine visit plus a full blood-count recheck (to detect late-pregnancy anaemia). Start formally counting fetal movements every day: pick one hour in the morning, afternoon and evening, record while lying on your left side or sitting; generally ≥3-5 an hour or ≥10 within 2 hours is normal; if it’s clearly under 10 in 2 hours or down by more than half from usual, seek care immediately. You can book the 30-32-week small scan. From week 34 you can start perineal massage (increasing the elasticity of the birth canal to lower the tear risk).
Signs that need immediate care
If any of the following occurs, contact your obstetrician or seek care promptly: ① clearly reduced fetal movement (under 10 in 2 hours or down by more than half from usual); ② vaginal bleeding or leakage of fluid (possible premature rupture of membranes); ③ regular contractions (once every 10 minutes or more often) with lumbar heaviness/downward pressure (watch for preterm labour); ④ persistent severe headache, blurred vision or upper-abdominal pain, especially with raised blood pressure or sudden obvious swelling (watch for preeclampsia); ⑤ itching all over, especially palms and soles with no rash (watch for ICP); ⑥ a fever over 38℃ that does not come down; ⑦ swelling, warmth or pain in one leg or sudden breathing difficulty and chest pain (watch for a clot/pulmonary embolism); ⑧ persistent abdominal pain or a tender uterus.
Week 28 frequently asked questions
Q: How do I count fetal movements in the third trimester?
A: From week 28, pick one hour in the morning, afternoon and evening each, lie on your left side or sit quietly, and record fetal movements, counting continuous movements as one. Generally ≥3-5 an hour or ≥10 within 2 hours is normal; you can also record the time it takes to feel 10 movements. If it’s clearly under 10 in 2 hours, or down by more than half from usual, seek care immediately.
Q: How many fetal movements count as normal, and what if they decrease?
A: The key is comparing to your baby’s usual pattern: a sudden clear decrease, weakness, or a long still period deserves more vigilance. If you notice fewer movements, first lie on your left side, eat a little, and quietly focus on sensing for 1-2 hours; if still clearly low or absent, go straight to the hospital for fetal-heart monitoring — don’t wait at home.
Q: Can I do perineal massage at week 28?
A: It’s not recommended to start until after week 34 (now is not the time), but you can learn the method: perineal massage helps increase the elasticity of the birth canal and perineal tissue, lowering the risk of tearing and episiotomy. Then use vitamin E oil or a special massage oil, 5-10 minutes daily, with dad helping if needed. Those with placenta praevia, vaginal infection or preterm-labour risk should consult a doctor first.
Q: What should I note on entering the third trimester at week 28?
A: Priorities: ① start counting fetal movements every day; ② prenatal visits change to every two weeks — do them on time; ③ keep boosting iron to prevent anaemia and control sugar (GDM); ④ book the small scan (30-32 weeks) and learn about delivery; ⑤ begin preparing the hospital bag in batches. Seek care promptly at signals of reduced movement, "show", broken waters or regular contractions.
Q: What should I do about anaemia at week 28?
A: Iron needs rise in the third trimester and dilutional anaemia is common. Food first: red meat, animal liver (≤50g a week), animal blood, spinach with vitamin C; when the prenatal visit confirms iron-deficiency anaemia the doctor prescribes iron, taken separate from calcium, milk, strong tea and coffee for better absorption — don’t take large doses on your own.
Q: How do I read the week-28 ultrasound report?
A: The three measurements at 28 weeks: BPD (biparietal diameter) about 70.6mm, AC (abdominal circumference) about 236.1mm, and FL (femur length) about 51.2mm, reflecting head, abdomen and leg development. If the three are in step, growth is good; a single slight deviation isn’t necessarily abnormal — go by your obstetrician’s overall assessment.
Q: How much weight gain is normal at week 28?
A: A cumulative gain of about 8-11kg by week 28 is common. For a standard BMI, the third trimester is about 0.4-0.5kg a week and the whole pregnancy recommends about 11.5-16kg. Watch the overall trend and manage by BMI with a weight-gain calculator; discuss too-fast or too-slow gain with your doctor.
Q: How is perineal massage done?
A: Wash your hands and trim your nails, take a comfortable semi-reclining position, lubricate with vitamin E oil or a special massage oil, insert your thumb about 3-4cm into the vagina and press slowly downwards and to both sides in a U-shaped massage; it should feel like a mild stretch, not pain, 5-10 minutes each time. If your partner helps, keep the movement equally gentle.
Q: Is there a recommended exercise duration in pregnancy?
A: ACOG advises women without complications about 150 minutes of moderate-intensity exercise accumulated weekly (walking, prenatal yoga, swimming), split over 5 days at about 30 minutes a day. In the third trimester focus on walking and stretching; avoid intense exercise and pressure on the abdomen; stop and seek care for pain or bleeding.
Q: Can I still get vaccines in the third trimester?
A: Yes. The CDC and ACOG recommend the Tdap whooping-cough vaccine at weeks 27-36 so the baby gets maternal antibody after birth to prevent Pertussis; the inactivated flu vaccine can also be given in flu season. Both are pregnancy-safe vaccines; tell them you’re pregnant before vaccination.
Q: Can I have sex at week 28?
A: If there’s 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 term, the more caution in the third trimester; pause if unwell or the doctor advises against it; seek care if there’s post-sex bleeding, pain or leaking fluid.
Q: What if I sleep poorly at week 28?
A: A growing belly, frequent urination and trouble turning over affect sleep. Use a pregnancy pillow for support, sleep on your left side, soak your feet before bed to relax, reduce evening fluids to cut night urination, and exercise moderately during the day. Avoid screens before bed and caffeinated drinks.
Q: What about leg cramps and swelling at week 28?
A: When a cramp hits, flex the foot and massage the calf; prevention relies on supplementing calcium and magnesium, drinking water and stretching before bed. For swelling, raise your legs, lie on your left side, walk to promote return flow, and moderately limit salt. If swelling suddenly worsens, spreads to the face and hands, or comes with headache or vision changes, check blood pressure to rule out preeclampsia.
Q: What should I avoid eating at week 28?
A: Avoid raw or undercooked meat, fish and eggs, high-mercury large fish, unpasteurised dairy, alcohol, caffeine over 200mg a day, and excess animal liver. If you have GDM, strictly control refined sugar and sugary drinks as well.
Q: What about heartburn at week 28?
A: Eat smaller meals more often and chew slowly, sit or stand for 30 minutes after meals before lying down, avoid eating in the 2-3 hours before bed, avoid spicy, greasy, overly sweet food and carbonated drinks, and prop up your upper body when sleeping. In serious cases, use a pregnancy-safe antacid under a doctor’s guidance.
Q: What about constipation and haemorrhoids at week 28?
A: Eat more coarse grains and vegetables for dietary fiber, drink 1.5-2L of water daily, walk after meals, and toilet regularly without squatting long; soak in warm water for haemorrhoids. Iron supplements can worsen constipation — discuss an adjustment with your doctor; in serious cases choose a pregnancy-safe medication rather than a stimulant laxative.
Q: What about lower-back pain at week 28?
A: It comes from a forward centre of gravity and ligament relaxation. Avoid long standing or sitting, wear supportive low-heeled shoes, use a belly-support belt, side-sleep with a pregnancy pillow, do prenatal yoga and pelvic-floor exercise, and apply local warmth. Sharp pain on one side or with bleeding and fever needs care.
Q: When should I prepare the hospital bag?
A: You can prepare it in batches from week 28 and basically have it ready by week 34. It sorts into three: mum’s supplies (maternity pads, nursing bra, toiletries), baby’s supplies (NB nappies, swaddle, going-home outfit), and documents (ID card, social-security card, prenatal records). Keep the list by the door so you can leave at a moment’s notice.
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.