Second Trimester of Pregnancy: A Week-by-Week India Guide

• The second trimester runs from week 13 to the end of week 27 (about months 4, 5 and 6).
• The detailed anomaly scan (TIFFA) at 18 to 22 weeks is the most important screening of this period. By law in India it cannot reveal the baby's sex.
• Most women feel the first baby movements (quickening) between 18 and 22 weeks (earlier in a second pregnancy).
• Screening for gestational diabetes (the glucose tolerance test) happens at 24 to 28 weeks; Tdap vaccine and anti-D for Rh-negative mothers are due around 27-28 weeks.
• Eat for two nutrients, not two plates: about 340 extra calories and 25 g extra protein a day, with iron, calcium, folic acid, iodine and DHA.
• Any vaginal bleeding, leaking fluid, severe headache with swelling, or a clear drop in baby's movements needs urgent review.

The start of the second trimester brings welcome relief for most women. As morning sickness fades and tiredness lifts, both your body and your mood usually settle.

How your baby is growing. At 14 weeks the fetus is about 8-9 cm long and weighs 50-70 g; by 18 weeks it is around 14-15 cm and 200 g. All the major organs have formed. Your baby can move its limbs and head, the eyes are still fused shut, and fine downy hair (lanugo) appears on the skin. Skeletal bones are hardening and the protective waxy coating (vernix caseosa) begins to form.

Brain and senses. This is a critical window for brain growth: the cerebral cortex is expanding and neurons are forming at peak rates. The ears are developing, and your baby can begin to perceive sound from about 16 weeks. Taste buds are forming and your baby swallows amniotic fluid. Good maternal nutrition — especially omega-3 DHA, iron, iodine and choline — supports this development.

Your body. The uterus rises above the pubic bone by about 14 weeks and reaches midway to the navel by 16-18 weeks. A bump may start to show to others — usually by 16-20 weeks in a first pregnancy, often earlier afterwards. Typical weight gain by 18 weeks is about 2-4 kg total. Your overall target depends on your pre-pregnancy BMI (IOM and ICMR: 11.5-16 kg for normal BMI; 12.5-18 kg if underweight; 7-11.5 kg if overweight; 5-9 kg if obese).

Common symptoms now. Increased appetite and cravings; round ligament pain (sharp twinges low on the sides of the belly when you move suddenly); ongoing constipation; nasal stuffiness (pregnancy rhinitis); the dark line down the abdomen (linea nigra) starting to appear; and mildly bleeding gums.

At your check-ups. Visits are usually every 4 weeks. Each includes blood pressure, a urine test (for protein, sugar and infection), weight, fundal height, and listening to the baby's heartbeat on Doppler. Routine bloods (CBC, blood group and Rh, HIV, syphilis, hepatitis B) are done if not already complete. The quadruple marker blood test for chromosomal and neural-tube problems may be offered around 15-18 weeks if first-trimester screening was not done.

Cultural and practical notes. Many families step up dietary support around this time (milk, ghee, dry fruits per family practice), and many women wait until now to announce the pregnancy publicly, as the miscarriage risk has dropped. It is also a good time to firm up your hospital and obstetrician, and to look into prenatal classes.

This is the heart of the second trimester. You feel your baby move for the first time, the detailed anatomy scan happens, and the pregnancy feels real.

How your baby is growing. At 19 weeks the fetus is about 15 cm and 240 g; by 23 weeks around 28 cm and 500 g. Vernix now coats the skin, hair grows on the head, sleep-wake cycles become regular, and the lungs are forming (though not yet ready to breathe air). The brain develops folds and ridges, and your baby can hear muffled sounds from outside — your voice, music, household noise.

Quickening. First-time mothers usually feel the first flutters between 18 and 22 weeks; experienced mothers often notice them earlier, around 14-18 weeks. Early movements feel like butterflies, bubbles or gentle taps, becoming distinct kicks and rolls as weeks pass. By 24 weeks you should feel movement regularly through the day.

The anomaly scan (TIFFA, level 2 ultrasound) at 18-22 weeks. This is the single most important scan of the second trimester. A trained sonographer or radiologist examines the brain, spine, heart, lungs, kidneys, stomach, bladder, limbs and face, plus the placenta position, amniotic fluid and growth. Most major structural problems can be picked up here. Read our full guide to the fetal anomaly scan (TIFFA) in India for what each part checks.

A note on sex determination. Under India's Pre-Conception and Pre-Natal Diagnostic Techniques (PCPNDT) Act, prenatal sex determination is illegal. The anomaly scan report does not include the baby's sex and the sonographer cannot disclose it. The law exists to prevent female feticide; asking puts both your family and the sonographer at legal risk.

If something is flagged. Many "soft markers" (such as choroid plexus cysts or an echogenic intracardiac focus) are common and resolve on their own. Significant findings may lead to a follow-up specialist scan (fetal echocardiography, MRI), genetic testing such as amniocentesis, and counselling with a maternal-fetal medicine specialist.

Your body. The bump is clearly visible and the uterus reaches the navel by about 20 weeks. Total weight gain by 23 weeks is typically 5-7 kg, gaining roughly 0.5 kg a week. You may notice hip and pelvic ache, leg cramps, vivid dreams, varicose veins, mild breathlessness, and deepening skin pigmentation (linea nigra, melasma).

Nutrition and movement. Keep protein, iron, calcium, iodine and DHA high while the brain develops fast. Moderate exercise — walking, prenatal yoga, swimming — is encouraged unless your doctor advises otherwise. For sleep, the left-side position improves blood flow to the uterus.

Family context. The godh bharai / seemantham (valaikappu in Tamil tradition) is usually held in the 7th or 8th month, but families often begin planning it now, along with discussions about who will help after delivery and where you will stay.

The final weeks of the second trimester bring your baby closer to viability and you closer to the more demanding third trimester. Important tests and vaccines fall in this window.

How your baby is growing. At 24 weeks the fetus is about 30 cm and 600 g; by 27 weeks around 36 cm and 900-1000 g. Lung surfactant production begins at about 24 weeks — vital for breathing after birth. The eyes can open from around 26 weeks, fingerprints and footprints have formed, and your baby may hiccup (felt as gentle rhythmic pulses).

Viability. Around 23-24 weeks a baby reaches the limit of survival outside the womb with intensive NICU care. Survival improves steeply with each week — roughly 50-70% at 24 weeks, about 85% at 26 weeks and around 95% at 28 weeks — and so does the quality of survival. This is why recognising and preventing preterm labour before 28 weeks matters so much.

Your body. The fundal height in centimetres now roughly matches your weeks of pregnancy (within about 2 cm). Total weight gain by 27 weeks is typically 8-10 kg. Expect more back pain, leg cramps at night, varicose veins, heartburn, breathlessness and disturbed sleep. You may also feel the first Braxton Hicks contractions — irregular, usually painless tightenings as your body practises for labour.

Glucose tolerance test (24-28 weeks). Screening for gestational diabetes is done now. FOGSI prefers a single-step 75 g OGTT (fasting, then blood glucose at 1 and 2 hours). Gestational diabetes affects roughly 5-10% of Indian pregnancies and is more likely with higher BMI, family history of diabetes, previous GDM or older maternal age. Our gestational diabetes guide explains the test and an Indian diet plan if you are diagnosed; most cases are managed well with diet, monitoring and sometimes medication.

Vaccines and injections. Per IAP and ACOG, the Tdap vaccine is given between 27 and 36 weeks (preferably 27-32) to protect the newborn from whooping cough — see our Tdap in pregnancy guide. Tetanus toxoid is given per the government schedule. If you are Rh-negative and the father is Rh-positive or unknown, anti-D immunoglobulin is given at 28 weeks to prevent sensitisation (about Rs 2,000-6,000).

Other tests. A repeat CBC checks for anemia, which is common in Indian pregnancies, plus a urine culture and thyroid tests if indicated.

Cultural traditions. The godh bharai (north and west India) or seemantham (south India) baby shower is often celebrated in the 7th or 8th month, with blessings from elders, gifts, and regional rituals. It is a way to celebrate and formally mark the advancing pregnancy.

Second-trimester nutrition fuels fast fetal growth, a rising blood volume and ongoing organ development. The Indian thali offers plenty of nutrient-dense options — the aim is eating for two nutrients, not two plates.

Calories and protein. You need about 340 extra calories a day — roughly a bowl of nuts and fruit or a small extra meal — and about 25 g extra protein (ICMR). Vegetarian sources include dals, beans, chickpeas, soya, paneer, milk, curd and eggs; non-vegetarians can add chicken, fish and lean meat. Combining protein sources gives a complete amino-acid profile.

Iron. Pregnant women need about 27 mg a day (ICMR). Good sources are leafy greens (palak, methi), dates, jaggery, ragi, sesame, lentils, eggs and (for non-vegetarians) chicken liver. India routinely advises iron supplementation (60-100 mg elemental iron) because deficiency is widespread. Take iron away from calcium, tea and coffee, and pair it with vitamin C foods (amla, guava, citrus). See our list of iron-rich foods in Indian pregnancy.

Folic acid, calcium and vitamin D. Continue folic acid (600 mcg). Calcium needs rise to about 1,200 mg a day (milk, curd, paneer, ragi, sesame, almonds, greens), with supplements if your diet falls short. Vitamin D supplementation is commonly advised in Indian women given high deficiency rates; aim for some morning sun too.

Iodine, omega-3 and choline. Use only iodised salt (220-250 mcg iodine supports fetal brain development). DHA (about 200-300 mg) is often supplemented — vegetarians can use algal oil, as covered in our omega-3 DHA in pregnancy guide. Choline (about 450 mg) comes from eggs, beans, peanuts and cruciferous vegetables.

Fibre and fluids. Aim for 25-30 g fibre (whole grains, dals, fruit, vegetables) to ease constipation, and about 3-3.5 litres of fluid daily including water, milk, coconut water and soups.

Foods to limit or avoid. Raw or undercooked meat and eggs; unpasteurised dairy; high-mercury fish (shark, swordfish, king mackerel); alcohol (avoid completely); caffeine over about 200 mg a day (roughly two cups of tea or one of coffee); large amounts of liver (high vitamin A); and street or unwashed food where hygiene is uncertain.

Cravings and aversions. Most cravings are harmless. Craving non-food items such as ice, chalk or soil (pica) can signal iron deficiency and should be discussed with your doctor. If aversions are limiting your nutrition, a dietitian can help.

On traditional "heating" and "cooling" foods. Many traditional foods (ghee, dry fruits, ragi, sesame) are genuinely nutritious, but extra ghee beyond a balanced diet is not necessary and can add excess weight. The Ayurvedic hot/cold classification is not validated by modern science, though individual tolerances vary.

With nausea gone and the bump still manageable, the second trimester is often the easiest time to stay active. Regular movement supports your heart, sleep, mood and birth preparation.

Why it helps. Per FOGSI and ACOG, moderate exercise improves fitness and sleep, reduces back pain, lowers the risk of gestational diabetes and preeclampsia, supports healthy weight gain, and may make labour and recovery easier.

What to do. Walking is the simplest option — aim for about 30 minutes most days. Prenatal yoga (with a qualified instructor), swimming, stationary cycling, prenatal Pilates and light strength work are all generally appropriate. Build towards 150 minutes of moderate activity a week. Use the "talk test": you should be able to hold a conversation while exercising.

Pelvic floor (Kegels). These strengthen the muscles supporting the bladder, uterus and bowel and help prevent leaks later. Do 10-15 contractions held for 5-10 seconds, several times a day — our Kegel and pelvic floor guide shows the technique.

What to avoid. Contact sports; activities with a fall risk (skiing, horse riding, off-road cycling); scuba diving and high-altitude activity; hot yoga; and lying flat on your back after 20 weeks (it can compress a major vein and reduce blood flow to the baby). Skip deep twists, inversions and deep backbends in yoga.

Indian context. In polluted cities, walk early before the AQI peaks, choose green, well-ventilated parks, and consider a mask on high-pollution days. Working women can fit in short walks at breaks, take the stairs, and do prenatal yoga at home. Build the habit now, while the bump is still light, so it carries into the third trimester.

Stop and seek care if you have bleeding, dizziness, chest pain, severe headache, calf pain or swelling, persistent breathlessness, abdominal pain, contractions that do not settle with rest, or reduced baby movements.

Several screening and diagnostic tests fall in the second trimester. Understanding what each one can and cannot tell you helps you make informed choices.

Detailed anomaly scan (18-22 weeks). The most thorough ultrasound of fetal anatomy — brain, spine, heart, kidneys, limbs, face and placenta. It detects most major structural problems and should be done by an experienced sonographer. Cost: about Rs 1,500-5,000 privately, free or subsidised in government facilities. Remember, under the PCPNDT Act the report cannot state the baby's sex.

Quadruple marker (15-18 weeks). A blood test (AFP, hCG, estriol, inhibin A) combined with your age to estimate the risk of Down syndrome, Edwards syndrome and neural-tube defects. It gives a risk figure (e.g. 1 in 350), detecting about 75-85% of Down syndrome cases. Cost: about Rs 1,500-4,000.

NIPT. A blood test analysing cell-free fetal DNA, available from 10 weeks, with much higher accuracy (around 99% for Down syndrome) and a low false-positive rate. It is a screen, not a diagnosis. Cost: about Rs 12,000-25,000.

Amniocentesis (15-20 weeks). An invasive diagnostic test offered when screening is concerning. Fluid is drawn from the amniotic sac for genetic analysis; it carries roughly a 0.5-1% miscarriage risk but gives a definitive answer.

Glucose tolerance test (24-28 weeks). FOGSI prefers the 75 g OGTT, diagnosing gestational diabetes if fasting glucose is greater than or equal to 92 mg/dL, the 1-hour value greater than or equal to 180 mg/dL, or the 2-hour value greater than or equal to 153 mg/dL. If diagnosed, management is diet, glucose self-monitoring, exercise, and insulin or metformin if needed.

Routine monitoring at each visit. A repeat CBC screens for Anemia in Pregnancy in India: Cutoffs, IFA, Diet & Treatment (hemoglobin below 11 g/dL); urine is checked for protein (a possible early sign of preeclampsia), sugar and infection; and blood pressure is recorded — above 140/90 on two readings, or 160/110 once, needs assessment.

Vaccines and anti-D. Tdap at 27-36 weeks, tetanus toxoid per schedule, and anti-D at 28 weeks for Rh-negative mothers. Each test should come with a clear discussion of what it can and cannot tell you, the cost, and the next steps.

Pregnancy in India is rarely a solo experience. Family, tradition and community shape it deeply — a source of great support, and occasionally of stress when opinions clash with current medical advice.

Navigating family advice. Grandparents and relatives often have strong views on diet, activity and birth planning. Clear, calm communication helps — and framing decisions as "the doctor recommended this" usually carries more weight in family discussions. Aim for a balance between respecting tradition and following evidence-based care.

Food traditions. Many families emphasise ghee, dry fruits, milk, ragi and fenugreek, and may discourage papaya or pineapple. Most traditional foods are nutritious; the commonly restricted fruits are safe in moderation (more on this in the myths section below). The Ayurvedic "heating/cooling" framework is not medically validated, but personal tolerances vary.

Baby shower. The godh bharai (north and west India) or seemantham / valaikappu (south India) is typically held in the 7th or 8th month, with blessings, gifts, bangles and prayers — both a celebration and a way to gather support around the mother.

Going to the mother's home. Many families follow the tradition of the pregnant woman returning to her parents' home for the final weeks and early postpartum period for familiar care. Modern adaptations balance this with access to good medical facilities.

Choosing a hospital. Weigh your obstetrician's affiliation, NICU availability, distance, cost (private delivery can run Rs 30,000 to Rs 3 lakh; government hospitals are free or very low cost), insurance and family preference.

Work and rights. Many Indian women work through pregnancy. The Maternity Benefit Act (2017) provides 26 weeks of paid leave for covered workers. Plan your leave timing and handover during the second trimester.

Partner and mental health. Partners increasingly attend scans, classes and antenatal visits. Pregnancy can also bring anxiety and low mood; perinatal mental health matters as much as physical health, and support is available — see pregnancy anxiety vs depression. Single mothers and non-traditional families receive the same obstetric care, with support sought from chosen family and community where needed.

The second trimester is usually healthier than the first, but a few symptoms need prompt obstetric attention. When in doubt, get checked — trusting your instinct is not overreacting.

Contact your obstetrician or go to the labour ward / emergency room straight away if you have any of the warning signs below. Most delivery hospitals have a 24-hour obstetric emergency area and on-call cover; save the numbers in advance.

The second trimester is the calmest time to make practical and emotional preparations for delivery and the early weeks with your baby.

Care and classes. Tour potential delivery hospitals (ask about birthing options, partner presence, NICU capacity and breastfeeding support). Childbirth-preparation classes (Lamaze, hospital-based) teach labour stages and breathing. Discuss a birth plan with your obstetrician, keeping it flexible. Some families also consider a doula or midwife for continuous labour support.

Breastfeeding prep. A prenatal IBCLC consultation, reading up on positioning and latch, and arranging postpartum lactation support all help you start on the front foot.

Practical shopping and admin. Build a maternity wardrobe (comfortable kurtas, adjustable salwars or Western maternity wear). Plan leave under the Maternity Benefit Act. Gather baby essentials gradually (a firm flat cot without soft items, cotton clothes, nappies, feeding supplies); a basic setup runs about Rs 30,000 to Rs 1 lakh. Pack the hospital bag by 32-34 weeks.

Postpartum planning. Decide who will help in the early weeks, set up an easy feeding and rest space, choose a pediatrician, and review insurance so the baby (including any NICU care) is covered from birth.

Self-care. Enjoy this relatively comfortable window — rest, time with your partner and friends, and hobbies that get harder with a newborn. The third trimester and early postpartum months are more demanding, so bank the calm while you can.

• ACOG — Exercise During Pregnancy
• ACOG — Prenatal Development: How Your Baby Grows During Pregnancy
• NHS — The Second Trimester / Pregnancy Week-by-Week
• WHO — Recommendations on Antenatal Care for a Positive Pregnancy Experience
• FOGSI — Diagnosis and Management of Gestational Diabetes Mellitus (DIPSI)
• PCPNDT Act, Ministry of Health and Family Welfare, Government of India
• ICMR-NIN — Dietary Guidelines for Indians / Nutrient Requirements (RDA)