DueDate.Baby

6 Weeks Pregnant: Baby Size, Symptoms and UK Milestones

First Trimester
Guide reviewed: July 2026Reviewed against cited UK guidance

At 6 weeks pregnant, use this UK guide to understand baby size, common symptoms, likely NHS timing, and the practical dates to keep on your radar.

6 weeks pregnant at a glance

  • You are in the first trimester.
  • Your baby is roughly the size of a lentil.
  • Routine care continues.
  • Every pregnancy is different, so don't worry if your experience varies slightly.

You are 6 weeks pregnant and in your first trimester. Your baby is about the size of a lentil. This week's key development: A Flickering Heartbeat. NHS note: Routine care continues.

This page is for general pregnancy planning and date guidance only. It is not medical advice, diagnosis, or treatment. Pregnancy dates are estimates and can change after a scan or advice from your midwife, GP, or maternity team.

If you have symptoms, concerns, or questions about your pregnancy, speak to your midwife, GP, or maternity team. For urgent help, use NHS 111; call 999 in an emergency. Read how we source and review content in our editorial policy.

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Baby's Development

Your baby is about the size of a lentil.

A Flickering Heartbeat — At an early scan this week, you might see and hear your baby's heartbeat for the very first time. Tiny arm and leg buds are forming, and facial features are beginning their delicate development. Fatigue may feel overwhelming — your body is building a placenta from scratch.

Illustration of a lentil, showing the approximate size of the baby at week 6
Lentil
Approx. 0.6cm

Your Symptoms

  • Nausea
  • Sore breasts
  • Bloating
  • Frequent trips to the toilet

Every pregnancy is different. You may experience all, some, or none of these symptoms — and that's completely normal. If anything concerns you, speak to your midwife.

NHS Appointments

Routine care continues. If you have any bleeding or severe pain, contact your local Early Pregnancy Unit (EPU).

Practical Advice for Week 6

Nutrition

  • Continue folic acid and vitamin D.
  • Stay hydrated — dehydration can worsen nausea and headaches.
  • Eat little and often rather than three large meals.
  • Include vitamin C-rich foods (oranges, peppers, strawberries) to help absorb iron.

Exercise

  • Swimming is excellent — the water supports your body and feels wonderful.
  • Continue pelvic floor exercises — aim for 3 sets of 10 squeezes per day.
  • Avoid lying flat on your back for extended periods during exercise.
  • Prenatal yoga classes are a great way to stay flexible and meet other expecting parents.

Wellbeing

  • Your body is building an entire organ (the placenta) — the tiredness is real and justified.
  • If you have severe nausea or vomiting, speak to your GP — hyperemesis gravidarum is treatable.
  • Keep communication open with your partner — pregnancy affects both of you.
  • A warm (not hot) bath before bed can help with sleep.

Preparation

  • If you have any bleeding or severe pain, contact your local Early Pregnancy Unit (EPU).
  • Check whether your employer has an occupational health team for pregnancy support.
  • Start reading about the different types of birth options available in the UK.
  • Think about whether you want combined screening at your dating scan (weeks 11–14).

Tip of the Week

Ginger tea or biscuits can help settle a queasy stomach.

Frequently Asked Questions for Week 6

How many months is 6 weeks pregnant?
At 6 weeks pregnant, you are roughly 1 months pregnant. Remember that pregnancy is typically measured in weeks rather than months for clinical accuracy.
What size is the baby at 6 weeks?
At 6 weeks, your baby is roughly the size of a lentil (about 0.6cm). At an early scan this week, you might see and hear your baby's heartbeat for the very first time. Tiny arm and leg buds are forming, and facial features are beginning their delicate development. Fatigue may feel overwhelming
What are the common symptoms at 6 weeks pregnant?
Common symptoms at this stage include nausea, sore breasts, bloating, frequent trips to the toilet. Remember that every pregnancy is unique, and it's normal to experience different symptoms.
Is 6 weeks in the first trimester?
Yes, 6 weeks falls within the first trimester.
Are there any NHS appointments at 6 weeks?
Routine care continues. If you have any bleeding or severe pain, contact your local Early Pregnancy Unit (EPU).

Tools & Calculators

Due Date Calculator UKPregnancy Week CalculatorTimeline by Due DateHow Many Weeks Am I?

Sources and further reading

Checked for UK week 6 pregnancy information guidance in July 2026.

How we review content

We prioritise official NHS and GOV.UK guidance, then relevant professional-body information where needed.

Source links are checked on the review date shown above. Your midwife, GP, maternity team, fertility clinic, or employer can give advice that is more specific to your circumstances.

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NHS Resources

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All Weeks

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