Short Answer: At 12 weeks pregnant, your baby is about 5 to 6 cm long, roughly the size of a plum or a lime, and weighs about 14 grams. All the organs and body parts are formed, and the reflexes are starting to work. This is the last week or two of the first trimester. Nausea and tiredness often begin to ease, the risk of miscarriage falls and many people share their news. The nuchal translucency scan is usually done between 11 and 13 weeks and 6 days. Keep taking folic acid, eat small meals often, rest when you need to and call a doctor for heavy bleeding, severe pain or vomiting you cannot control.
Pregnancy weeks are counted from the first day of your last period, not from conception. Twelve weeks pregnant means about ten weeks since conception. You are in your third month with about 28 weeks to go. For the week before, read our guide to 9 weeks pregnant, for the next, 11 weeks pregnant, and to follow the whole journey see our pregnancy guidelines week by week.
Week 12 at a glance
| Detail | At 12 weeks |
|---|---|
| Trimester | First, ending around week 13 |
| Months | About 3 |
| Baby’s length | About 5 to 6 cm (2 to 2.4 inches) |
| Baby’s weight | About 14 grams |
| Heart rate | About 150 to 160 beats per minute |
| Weeks to go | About 28 |
| Size comparison | A plum or a lime |
Your baby at 12 weeks
Growth. Your baby has grown quickly. Length nearly doubled between weeks 10 and 12, and the body is catching up with the large head. Growth over the next weeks is mostly weight and length, not new structures.
Face and head. The face looks more human. The eyes, which started on the sides of the head, are moving toward the front, and the ears are in their final position. The eyelids stay closed and fused. The neck is longer, and the head is more upright.
Hands and feet. Fingers and toes are separate, with the first fingernails and toenails forming. Fingerprint patterns begin to form on the fingertips. Your baby can open and close the fists and curl the toes.
Reflexes and movement. Your baby kicks, stretches and may suck a thumb. The muscles and nerves are linking up, so reflexes such as curling the fingers around an object are starting. You will not feel any of it yet. Most people feel the first movements between 16 and 22 weeks, and later in a first pregnancy.
Organs. The kidneys are making urine, which passes into the amniotic fluid. The liver is producing bile, and the gut has moved fully into the abdomen. The vocal cords are formed. The bone marrow is starting to make blood cells. The brain is growing quickly.
Sex. The external genitals are developing and can be distinguished by this week. A routine scan usually cannot reliably show the sex yet, and any guess at 12 weeks is uncertain. The routine anomaly scan at 18 to 22 weeks is when most parents find out.
Placenta. The placenta has largely taken over producing pregnancy hormones and feeding your baby. That is the main reason early symptoms such as nausea often fade over the next weeks.
Your body at 12 weeks
Womb. Your womb is about the size of a grapefruit and is rising above the pelvic bone. Many people notice a firmer, rounder lower belly, and some start to show. Others do not show until week 14 or later, especially in a first pregnancy.
Hormones. hCG has fallen from its peak. Estrogen and progesterone stay high. For many people, the nausea and exhaustion of the first trimester begin to ease between weeks 12 and 14. For others, they last longer, and that is normal too.
Energy and appetite. As nausea fades, your appetite and energy often return. You may feel hungry after weeks of feeling sick. Eat well, but you do not need extra calories until the second trimester.
Blood and circulation. Your blood volume keeps rising, so you may feel dizzy when you stand quickly. Veins may show more on your breasts and legs. Some people get nosebleeds or a stuffy nose.
Skin and hair. Hormones can cause a glow, acne, dry skin or darker patches on the face. Hair often looks thicker. A dark line may appear down the belly later.
Weight. Total gain in the first trimester is usually 0.5 to 2 kg. Some people lose weight because of nausea. After this, weight gain usually picks up.
Mood. Mood swings and anxiety often settle as hormone levels stabilise, though worry about scan results is common.
Common symptoms and what helps
| Symptom | Why it happens | What helps |
|---|---|---|
| Nausea | Falling but still high hCG and estrogen | Small meals every 2 to 3 hours, dry biscuits before getting up, ginger tea, cold sips of water |
| Tiredness | Progesterone, extra blood volume | Early bedtime, a short afternoon rest |
| Bloating and gas | Slower digestion | Smaller meals, avoid fizzy drinks, short walks |
| Constipation | Slow gut, iron tablets | Fibre, water, daily movement |
| Heartburn | Relaxed valve at the top of the stomach | Smaller meals, avoid spicy and oily food, stay upright after eating |
| Frequent urination | Womb pressing on the bladder | Drink water by day, less before bed |
| Dizziness | Blood pressure changes, low blood sugar | Eat regularly, stand up slowly |
| Headaches | Hormones, tiredness, dehydration | Rest, fluids, ask your doctor before taking medicine |
| Stuffy nose, nosebleeds | More blood flow to the nose lining | Saline spray, a humidifier, pinch the nose and lean forward for a bleed |
| Mild cramps or pulling low in the belly | Womb and ligaments stretching | Rest, change position, warm bath |
| Bleeding gums | More blood flow to the gums | Soft brush, gentle flossing, dental check |
| Skin changes | Hormones | Sunscreen and a hat, gentle moisturiser |
Do not start vitamin B6, anti-nausea medicine or herbal remedies without your doctor’s advice.
When to call a doctor
| Usually normal | Call a doctor soon |
|---|---|
| Mild period-like cramps | Severe or one-sided abdominal pain |
| Light spotting that stops | Bleeding that soaks a pad in an hour, or with clots |
| Nausea with some vomiting | Cannot keep water down for 24 hours, dark urine or fast weight loss |
| Tiredness, mood swings | Fainting, severe dizziness or shoulder-tip pain |
| Milky white discharge | Fever, burning urination or foul discharge |
| Occasional headache | Severe headache with blurred vision or swelling |
| Breast tenderness | Passing tissue or fluid |
Report any bleeding to your doctor, even if it is light. Severe, constant vomiting can be hyperemesis gravidarum, which is treatable. If you feel sad, anxious or hopeless for more than two weeks, tell your doctor. If you ever have thoughts of harming yourself, seek help right away.
Tests and scans this week
This is the week for first-trimester screening. Which tests you can choose depends on where you live and what your doctor offers.
| Test | When | What it does |
|---|---|---|
| Dating scan | 8 to 14 weeks | Confirms due date, heartbeat and number of babies |
| Nuchal translucency scan | 11 to 13 weeks and 6 days | Measures fluid at the back of the baby’s neck |
| Combined screening blood test | 11 to 13 weeks and 6 days | Checks pregnancy hormones, used with the scan |
| NIPT (blood test) | From 10 weeks | Screens for Down syndrome and some other conditions |
| CVS (chorionic villus sampling) | 10 to 13 weeks | Diagnostic test offered when risk is high |
| Anomaly scan | 18 to 22 weeks | Checks organs, growth and often the sex |
The nuchal translucency scan. A sonographer measures your baby and a small fold of fluid at the back of the neck. With your age and blood test results, this gives an estimate of the chance of conditions such as Down syndrome, Edwards syndrome and Patau syndrome. The scan also confirms your due date and heartbeat and counts the number of babies.
What the results mean. A screening result is a chance, not a diagnosis. A low chance is reassuring but is not a guarantee. A higher chance means you can talk to your doctor about CVS or amniocentesis, which give a firm answer. Most people with a higher chance result still have a healthy baby. Ask what each option costs and what it involves.
Other tests. Ask about your hemoglobin, blood group and Rh factor, blood sugar, and infection tests such as hepatitis B, HIV and syphilis if they have not been done. Thalassemia is common in South Asia, so ask whether you and your partner should be screened. Ask about tetanus vaccination, which is usually given in the second trimester in Bangladesh.
What to eat and what to avoid
Eat more of:
- Protein: eggs, well-cooked fish, chicken, lentils (dal), beans and milk
- Iron-rich foods: leafy greens (shak), lean meat and lentils, with lemon or guava for vitamin C
- Fruit and vegetables: a variety of colours every day
- Whole grains and fibre: brown rice, whole wheat roti and oats
- Calcium: milk, yogurt and small fish eaten with the bones
- Water: about 8 to 10 glasses across the day
Take as advised: folic acid, usually 400 micrograms a day, and the iron, calcium and vitamin D your doctor prescribes. Do not add extra supplements on your own.
Limit: caffeine to about 200 mg a day, which is one or two cups of tea or a single small coffee, and sugary and fried snacks.
Avoid:
- Alcohol and all tobacco, including second-hand smoke and products like zarda and jorda
- Raw or undercooked meat, fish and eggs
- Unpasteurized milk and cheese
- Unwashed fruit and vegetables
- Large predatory fish that can be high in mercury, such as shark and swordfish
- High-dose vitamin A supplements, and large amounts of liver
- Herbal tonics and remedies your doctor has not approved
Your calorie needs rise a little in the second trimester, by about 300 calories a day. Choose quality over quantity. Wash your hands and produce, and cook everything through.
Everyday tips for week 12
Rest. Go to bed early and nap when you can. A pillow between your knees helps side-sleeping. Later in pregnancy, sleeping on your side is usually recommended, so start the habit now.
Move. A daily walk helps digestion, sleep and mood. Prenatal yoga, swimming and pelvic floor exercises are fine for most people. Avoid heavy lifting, contact sports and anything with a risk of falls. Stop and call your doctor if you have pain, bleeding or dizziness.
Medicines. Do not take any medicine, including painkillers and herbal products, without asking a doctor or pharmacist. Do not stop prescribed medicine on your own.
Heat. Avoid saunas, steam rooms and very hot baths.
Dental care. Hormones can make gums bleed. Brush gently, floss and see a dentist if you have pain.
Clothes. Switch to loose, comfortable clothes and a supportive bra. You may need larger sizes soon.
Skin. Use sunscreen and a hat, since pregnancy can darken patches on the face.
Travel. The second trimester is often the most comfortable time to travel. Check with your doctor before long trips.
Sex. It is safe for most healthy pregnancies unless your doctor advises otherwise.
Partners. Come to the scan if you can, help with chores and ask how she feels, then listen.
Work and maternity leave
Many people feel better in the second trimester and can work more comfortably. Tell your doctor about night shifts, chemicals, heavy lifting or long standing. Under Bangladesh’s labour law, working mothers in the private sector are entitled to 16 weeks of paid maternity leave, and government employees receive six months. Check your own contract, because the rules and your employer’s policies can differ. It helps to plan your leave and when to tell your employer.
Sharing the news
Many people wait until after the first-trimester scan or until 12 weeks to share the news, because the chance of miscarriage falls. It is your choice. You might tell close family first, or tell your employer when you need adjustments. You do not owe anyone an explanation if you prefer to wait.
What comes next: the second trimester
The second trimester begins at week 14. Many people have more energy, less nausea and a visible bump. Around weeks 16 to 22 you may feel the first flutters of movement. The routine anomaly scan is at 18 to 22 weeks, and screening for gestational diabetes usually comes at 24 to 28 weeks. Keep up your prenatal visits, usually every four weeks at this stage.
Checklist for this week
- Book or confirm your nuchal translucency scan and screening blood tests
- Ask about NIPT, CVS and the costs
- Take folic acid and any prescribed supplements
- Ask about thalassemia screening and tetanus vaccination
- Keep a list of your medicines and share it with your doctor
- Stock simple snacks for nausea, such as biscuits, bananas and nuts
- Cut caffeine, alcohol and tobacco
- Save your doctor’s number and the nearest hospital’s emergency number
- Check your work and maternity leave plans
- Tell one trusted person how you are feeling
FAQ
How big is the baby at 12 weeks?
About 5 to 6 cm long and 14 grams, roughly the size of a plum or a lime. Sizes vary a little between babies.
Is the risk of miscarriage lower at 12 weeks?
Yes. The risk falls after the first trimester, particularly once a heartbeat has been seen. Call your doctor for any bleeding or severe pain.
Should I have a bump at 12 weeks?
Not necessarily. Many people do not show until week 14 or later, and some show a small bump now. Both are normal.
When does morning sickness stop?
It often eases between weeks 12 and 14, but it lasts longer for some. Tell your doctor if it is severe.
What is the 12-week scan?
Usually the nuchal translucency scan, done between 11 and 13 weeks and 6 days. It measures the fluid at the back of the baby’s neck, confirms your due date and checks the heartbeat. It is a screening test, not a diagnosis.
Can I find out the baby’s sex at 12 weeks?
Not reliably. The anomaly scan at 18 to 22 weeks is when most parents find out.
Can I feel the baby move at 12 weeks?
No. Your baby moves, but you will not feel it until around 16 to 22 weeks.
Is it safe to exercise at 12 weeks?
Yes for most healthy pregnancies. Walking, swimming, gentle yoga and pelvic floor exercises are good. Avoid contact sports and heavy lifting.
Note: This article gives general information and does not replace advice from your doctor or midwife. Every pregnancy is different. Call your doctor or go to a hospital if you have bleeding, severe pain, fainting or any symptom that worries you.
