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30 Weeks Pregnant: What to Expect, Baby Development & Third Trimester

Expert tip

Pelvic floor exercises (Kegels) now and throughout the third trimester significantly reduce incontinence and support recovery.

Baby's development this week

  • Body temperature regulation beginning
  • Lanugo (fine hair) disappearing as fat increases
  • Red blood cells now produced entirely by bone marrow
  • Brain development accelerating dramatically
Science fact

At 30 weeks, the fetal brain begins producing cortisol in response to stress — the earliest evidence of a stress response system. This is why maternal stress management directly benefits fetal neurodevelopment.

Your symptoms this week

Stress incontinence
leaking urine when sneezing; Kegels reduce this significantly
Braxton Hicks intensifying
time them; regular contractions before 37 weeks need medical attention
Practice contractions — normal from mid-pregnancy. Stay hydrated, change position, rest.
Fatigue returning
third trimester is physically demanding; rest without guilt
Rest when you can — your body is building a placenta. Iron-rich foods (spinach, lentils) help. Short walks boost energy.

Changes in your body

  • Braxton Hicks may feel intense — usually irregular and painless
  • Leaking urine when sneezing/coughing (stress incontinence) common
  • Sleeping 8+ hours with frequent interruptions
  • Significant fatigue returning
Mental health this week

Sleep deprivation from late pregnancy is both preparation and practice for the newborn period. This is not comforting, but understanding it

Starting Birth Preparation at 30 Weeks

At 30 weeks, you have approximately 10 weeks to go. Birth preparation isn't about anxiety — it's about information, practical logistics, and having considered preferences so you're not making decisions at 3am in early labor.

What to do at 30 weeks for birth preparation:

  • Start or complete antenatal classes: NHS antenatal classes, NCT, or online options (e.g. Positive Birth Company). Best attended at weeks 30–34, before exhaustion peaks.
  • Research your birth preferences: Consider preferences for pain relief (epidural, gas and air, water birth), monitoring (continuous CTG vs intermittent), and what matters most to you. A birth preferences document helps your care team.
  • Hospital bag: Start packing. You don't need to finish it, but having it started means you're not scrambling at 37 weeks.
  • Car seat research: Takes longer than expected to find the right one. Research now; purchase by 36 weeks and check installation.
  • Maternity/paternity leave admin: Notify your employer of your leave dates. In the UK, MATB1 form is needed for maternity pay claims.

See the postpartum guide for what recovery looks like — reading it before birth is much easier than after.

Nutrition focus

  • Magnesium glycinate (300–400mg before bed) reduces leg cramps, improves sleep, and supports muscle function
  • Continue prenatal vitamin — even when appetite drops in late pregnancy
  • Herbal teas to avoid: pennyroyal, black cohosh, blue cohosh — all can stimulate contractions
Appointment / test

Discuss group B strep (GBS) test timing — usually 35–37 weeks. GBS positive means IV antibiotics in labor (routine and effective).

This week's checklist

Continue pelvic floor exercises — 3x daily minimum
Prepare a rough birth plan and share with your support person
Research newborn feeding (breastfeeding prep, formula options) to reduce postpartum stress

Frequently Asked Questions: 30 Weeks Pregnant

How big is baby at 30 weeks?+

At 30 weeks, your baby is approximately 15.7 inches (39.9 cm) long and weighs about 2.9 lbs (1.3 kg) — roughly the size of a head of cabbage. Brain development is accelerating rapidly; the cerebral cortex is forming its characteristic folds and grooves.

What are common symptoms at 30 weeks pregnant?+

Common symptoms at 30 weeks: shortness of breath, Braxton Hicks contractions increasing in frequency, heartburn, back and pelvic pain, difficulty sleeping, swollen feet and ankles, and rib pain as the uterus expands upward.

What trimester is 30 weeks?+

30 weeks is in the third trimester (weeks 28–40). You have approximately 10 weeks until your due date.

When should I pack my hospital bag?+

Start packing your hospital bag by week 30–32. You don't need it ready, but having the essentials gathered reduces last-minute stress. Key items: ID and birth plan, comfortable clothing, phone charger, toiletries, snacks, newborn coming-home outfit, nappies, and feeding supplies.

What should I be doing to prepare for birth at 30 weeks?+

At 30 weeks: attend antenatal classes (book if not already), research birth preferences and pain relief options, begin researching car seats, start packing your hospital bag, and read about the postnatal period so expectations are realistic. See postpartum recovery week by week.

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