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20 Weeks Pregnant: Halfway There, Anatomy Scan and Baby Development

Expert tip

If you want to find out the sex, the anatomy scan at 18–22 weeks is usually when it becomes clear. Tell the sonographer at the start of the appointment whether you want to know.

Baby's development this week

  • Halfway point of pregnancy
  • Baby swallowing amniotic fluid to practice digestion
  • Eyebrows and eyelashes growing
  • Sleep and wake cycles becoming more regular
Science fact

At 20 weeks, the baby is exactly halfway through gestation. Research shows that babies born at 22–23 weeks can now survive with intensive care, highlighting how rapidly viability develops.

Your symptoms this week

Swelling in feet and ankles is now common
normal in absence of headache or high BP
Elevate feet when sitting, stay hydrated, reduce sodium. Sudden severe swelling: call your provider.
Shortness of breath beginning as uterus pushes on diaphragm
Normal as uterus grows. Sleep propped up, avoid lying flat. Sudden severe breathlessness: seek care.
Increased libido possible
blood flow to pelvic region increases

Changes in your body

  • Anatomy scan typically this week — sex often revealed
  • Belly button may fully pop out
  • Lower back pain common
  • Shortness of breath may begin as uterus pushes on diaphragm
Mental health this week

The anatomy scan is a significant emotional milestone. If concerns arise, remember that most findings are minor and most pregnancies have completely normal scans.

Nutrition focus

  • Iron, calcium, and DHA are the three
  • of the second half of pregnancy
  • Weight gain on track? For normal BMI, average total gain by 20 weeks is 8–16 lb (IOM guidelines). Underweight women gain more, overweight women gain less
  • Hydration: amniotic fluid needs constant replenishment — drink consistently throughout the day
Appointment / test

20-week anatomy scan: your most detailed look at baby. Often when sex is revealed if desired.

This week's checklist

Discuss anatomy scan results with provider if any findings
Start iron-rich food focus if any anaemia indicators
Consider childbirth education class — book now (often fill 6–8 weeks ahead)

Anatomy scan and all prenatal tests: A complete plain-language guide to every test this pregnancy — NIPT, NT scan, anomaly scan, and more — is at Prenatal Tests Explained →.

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