Day 100 baby development and maternal changes

A: About 20-30% of pregnant women get nasal congestion, mostly from estrogen swelling the nasal lining. A humidifier, saline spray or drops, and sleeping with the head a little raised help; avoid compound cold medicines containing pseudoephedrine. If it’s severe or comes with thick yellow mucus and fever, see an ENT doctor first to rule out infection.

A: The fundus sits between the pubic bone and the navel; first-time mothers usually just start showing faintly and it may not show in clothing; women who’ve given birth show earlier. Fundal height measured by the doctor is the gold standard for growth — no need to compare with others.

A: The mid-trimester screen is generally arranged at weeks 16-18; you can book it this week. It’s a maternal blood draw measuring AFP/hCG/uE3/Inhibin A to assess chromosome and neural-tube-defect risk. If the NT window passed and you want results earlier, you can also go straight to NIPT (generally from week 12).

A: The mid-term screen is low-cost but detects trisomy 21 at about 70-80%; NIPT has a detection rate over 99%, no miscarriage risk, but higher cost. Older mothers (≥35), NT abnormalities, or a history of chromosome problems more warrant NIPT — combined with your doctor’s advice.

A: ACOG recommends 400-800μg of folic acid daily from before pregnancy through the first trimester to prevent neural-tube defects, usually through week 12; after that, you can switch to a pregnancy multivitamin containing folic acid as your doctor directs — follow your prenatal checkup.

A: Usually not yet. First-time mothers typically first feel movement at weeks 18-22; women who’ve given birth may feel it at weeks 16-18. At week 15 the baby is active but small with plenty of cushioning, so not feeling it yet is normal.

A: Week-15 ultrasound three measures: BPD about 30mm (biparietal diameter — head width), AC about 90mm (nutrition and liver development), and FL about 16mm (femur length). All three within the week’s standard range indicates coordinated development; take your obstetrician’s overall reading as authoritative — a single value slightly off isn’t necessarily abnormal.

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. Entering the comfortable phase at week 15, exercise regularly; avoid strenuous activity and abdominal pressure — stop and seek care if pain or bleeding occurs.

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 (September to April); tell the vaccinator you are pregnant.

A: In the second trimester the fetus is relatively stable; as long as there is no low-lying placenta, bleeding, cervical insufficiency or threatened miscarriage, gentle sex is usually fine — choose positions that don’t press the abdomen and move gently. If you feel unwell or your doctor advises avoidance, pause.

A: From week 15, a standard BMI gains about 0.4-0.5kg a week, with a cumulative gain of about 2-5kg by week 15 being common. Watch the overall trend rather than any single week; talk to your doctor if too fast or slow, and you can manage by BMI with a pregnancy weight-gain calculator.

A: Pregnancy hormones slow intestinal movement and the growing uterus presses the bowel, so constipation is common. Drink 1.5-2L of water a day, eat more whole grains, fruit and vegetables for fiber, walk after meals, and use the toilet regularly without sitting long. If severe, don’t buy medicine on your own — ask a doctor for a pregnancy-safe laxative.

A: From mid-pregnancy you can practice left-side sleeping — it increases uterine-placental blood flow and improves oxygen to the baby. A pregnancy pillow helps support the abdomen and legs; you don’t have to stay on the left all night — comfort and good sleep matter. Avoid face-down pressure on the belly.

A: Avoid raw/undercooked meat, fish and eggs (toxoplasmosis, Listeria), high-mercury large fish (shark, swordfish, etc.), unpasteurized dairy, alcohol (no amount is safe), caffeine ≤200mg a day, and excess liver (vitamin A overdose). Well-cooked food and thorough heating are safer.

A: The second trimester is a better flying window; most airlines don’t require a doctor’s note before week 32 and request one after (mostly banning after week 36). Choose an aisle seat to move around, hydrate, and wear compression socks to prevent clots. If you have bleeding, pain or placental problems, consult your doctor before traveling.

A: In mid-pregnancy the center of gravity shifts forward and relaxin loosens ligaments, so back ache gradually grows. Avoid long standing or sitting, wear supportive low-heeled shoes, place a pregnancy pillow between the legs when side-lying, and do prenatal yoga and pelvic-floor exercises. Severe one-sided pain or pain with bleeding/fever warrants care.

A: Higher estrogen increases discharge; milky-white or clear with no odor is normal. Watch for yellow-green color, fishy smell or itching (infection), or a sudden large gush of watery fluid (premature rupture of membranes) — seek care if these occur. Wear cotton underwear, keep clean, and don’t do vaginal douching.

A: ACOG recommends about 1000mg of calcium and 27mg of iron a day in mid-pregnancy. For calcium prioritize milk, soy products and sesame paste; for iron prioritize red meat, liver (≤50g/week) and spinach paired with vitamin C. Whether to add supplements depends on diet and checks; taking iron and calcium separately absorbs better.

A: The anatomy scan (systematic scan) is at weeks 20-24, and popular hospitals have tight slots often needing booking weeks ahead. Though this week is early, start paying attention and book it around the 16-18-week screen to avoid missing the best week range.