Second Trimester • 4 months

20 Weeks Pregnant: Baby Size, Symptoms & Due Date Milestones

Comprehensive gestational timeline analysis, fetal growth metrics, anatomical development, and personalized due date milestones for week 20.

Gestational Classification
At 20 weeks pregnant, you are in your Second Trimester

Equivalent to 4 months • 140 calendar days of gestation completed

Overall Gestational Progress 50.0% of 40 Weeks (140 of 280 Days)
Days Pregnant
140 Days
Exact duration
Days Until Due Date
140 Days
20.0 weeks left
Trimester Stage
2nd Trimester
Weeks 14 – 27
Fetal Size Category
Banana (Halfway Mark)
16.4 cm

Baby Development at 20 Weeks Pregnant

Baby Size Comparison
Banana (Halfway Mark)

Fruit / Vegetable Analogy

Estimated Length
16.4 cm

Crown to Heel (Total Length)

Estimated Weight
300 g

Fetal Weight Standard

Congratulations on reaching Week 20—the official HALFWAY MILESTONE of your 40-week pregnancy journey! From this week forward, measurements shift from crown-rump length to full crown-to-heel length.

The fetus swallows significant amounts of amniotic fluid daily, practicing digestion. Meconium—a harmless, dark greenish-black mixture of shed epithelial cells, amniotic fluid, and bile—accumulates in the fetal bowel for post-birth excretion.

Personalized Due Date Recalculator

Input your last menstrual period (LMP) to verify your exact week, remaining days, and estimated delivery date.

Real-Time Engine
Recalculated Due Date
Select your LMP date
Days Remaining
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Current Gestation
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Disclaimer: Computational estimates are based on standard clinical algorithms (e.g., Naegele's rule) for educational and planning purposes only. They do not constitute formal medical evaluation, diagnosis, or clinical obstetrics advice.

Disclaimer: Computational estimates are based on standard clinical algorithms (e.g., Naegele's rule) for educational and planning purposes only. They do not constitute formal medical evaluation, diagnosis, or clinical obstetrics advice.

Maternal Symptoms & Clinical Guidance at Week 20

Common Physical Symptoms

  • Kicks and movements easily felt, often visible to an outside hand
  • Your belly button may begin to flatten or pop outward ('outie')
  • Mild shortness of breath as uterus reaches level of belly button
  • Appetite remains hearty and energetic

Clinical Action Items

  • Attend your comprehensive 20-week Level II Anatomy Ultrasound
  • Find out the baby's biological sex if you wish to know!
  • Celebrate reaching the halfway mark with a special date or milestone photo
  • Begin exploring local hospital tours, birthing centers, or doula services

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Explore Second Trimester Weeks

Frequently Asked Questions About 20 Weeks Pregnant

The 20-week ultrasound thoroughly checks the baby's brain chambers, heart chambers, spine, kidneys, stomach, limbs, placenta position, umbilical cord vessels, and amniotic fluid volume to ensure healthy anatomical development.