6 Weeks Pregnant: Development, Symptoms & Care

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Small limb buds are appearing.

General education; your own maternity team guides your care. Sources checked 30 September 2026. No clinical review is claimed. Editorial standards.

Your baby at 6 weeks

About 6 mm (head to bottom); roughly comparable to a pea. Sizes vary.

Arm and leg buds are beginning to form.
Early head and ear structures are developing beneath very thin skin.

The weekly size is an approximate illustration. Your team assesses growth using your pregnancy dates, examination and scans where indicated.

Development reference: NHS: week 6 development and symptoms.

Symptoms and body changes

Nausea can occur at any time of day; severity and timing vary.
Tiredness, tender breasts, bloating or constipation may occur.
Symptoms can change from day to day; their presence or absence cannot confirm the baby’s wellbeing.

Your symptoms and bump may differ from someone else at the same week.
Discuss changes that worry you with your maternity team; you do not need to wait for the next appointment.

Check when to seek care if you are unsure about a symptom.

Your care plan this week

Contact maternity services when you know you are pregnant. Ask when your first appointment and screening discussions should take place.

Planning tip

Prepare a list of medicines, supplements and past health issues for your care team.

A practical checklist

Prepare a list of medicines, supplements and past health issues for your care team.
Write down questions or symptoms to discuss with your maternity team.
Check the date and purpose of your next appointment.

Activity and comfort

For an uncomplicated pregnancy, build activity gradually toward 150 minutes a week if your maternity team agrees. Keep a pace at which you can talk, avoid overheating and activities with fall or impact risk, and stop if you feel unwell. Avoid prolonged exercise flat on your back, particularly after 16 weeks.

Mental wellbeing

Tell your midwife or doctor if anxiety, low mood or loss of interest persists or affects daily life. Support and treatment are available. Do not stop prescribed mental-health medicine without advice. Seek immediate help if you may harm yourself or someone else.

Nutrition guidance

Folic acid matters before conception and early in pregnancy. US guidance recommends 400–800 micrograms daily from supplements or fortified foods for people who could become pregnant; discuss your prenatal product and any higher-dose need with your clinician.
Include varied foods such as vegetables, fruit, whole grains, beans, eggs or other protein foods. Food folate does not replace the recommended folic acid supplement.
Check supplement labels together with your maternity team. Taking several prenatal or vitamin products can duplicate ingredients; more is not automatically better.

Needs and supplement recommendations vary by country and individual circumstances. NIH: pregnancy nutrients and supplements · NHS: pregnancy food safety · FDA/EPA: fish choices · NHS: severe pregnancy sickness.

Understanding movements

First movements are usually felt at 16–24 weeks. If none have been felt by 24 weeks, contact your midwife. Once you know the usual pattern, call maternity care immediately if it slows, stops or changes. Do not wait until the next day or use a home Doppler to reassure yourself.

Rest and sleep position

From 28 weeks, settle to sleep on either side, including for naps. If you wake on your back, turn onto your side. Pillows may help you feel comfortable; contact your clinician about persistent sleep problems.

When to get medical help

Get medical help immediately for trouble breathing, chest pain, fainting, severe or persistent abdominal pain, a severe headache or vision changes, fever of 38°C or higher, or marked swelling of the face or hands.
Seek urgent maternity advice for bleeding or spotting, leaking fluid, severe vomiting that prevents drinking, or one-sided painful leg swelling. Severe bleeding or collapse requires your local emergency service.
If you are less than 37 weeks pregnant and have regular contractions or tightenings, contact maternity care immediately. Do not wait for a contraction timer.
This is not an exhaustive list. If something feels wrong, contact your care team; tell them you are pregnant.

Read pregnancy warning signs and the CDC urgent warning signs.

Questions about week 6

How big is a baby at 6 weeks?

The NHS weekly guide gives an illustrative length of about 6 mm from head to bottom. This is not a target for an individual baby. Your maternity team interprets growth in context.

What should I focus on at 6 weeks?

Prepare a list of medicines, supplements and past health issues for your care team.

When should I contact maternity care?

Contact your team whenever you are worried, and immediately for urgent symptoms or a change in the usual movement pattern. Do not wait for the next appointment or a timer threshold. Use your local emergency service for severe symptoms or collapse.

Sources and editorial update

Guidance checked 30 September 2026. NHS weekly development summaries are illustrative; appointments and local recommendations may differ. Birth-term definitions use NIH / NICHD.

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Keep your questions together

Use the interactive guide to explore development, practical reminders and linked sources.

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