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Second Trimester (Weeks 14 - 27) Week 17 of 40
Last reviewed by medical team: June 2026 Evidence-Based Care Check
Fetal Size Comparison

Week 17 Size: Pomegranate

About the size of a pomegranate.

Length 13 cm 5.1 inches
Weight 140 g 4.9 oz

Relative Visual Scale

Solid circle represents your baby's size. Dotted circle shows the full-term week 40 size threshold.

Inside The Womb

Baby's Development

A layer of fat (adipose tissue) starts to form under the baby's skin to provide warmth. The sweat glands are developing, and the baby is practicing sucking and swallowing.

Weekly Milestones

  • Fat Storage Begins
  • Sweat Glands Form
Maternal Health

Your Body & Symptoms

Your center of gravity is shifting, which can make you feel slightly off-balance. Your appetite might be robust, and you may experience sciatic nerve pain.

Common Symptoms this Week

Sciatica (shooting pain down legs) Increased appetite Tailbone pain Skin pigmentation changes (linea nigra)

Doctor & Care Recommendations

  • Do gentle stretching or pelvic tilts to relieve sciatic nerve pain.
  • Choose healthy snacks like nuts, fruit, and yogurt for your increased appetite.
  • Be careful when walking; wear flat, stable shoes.

Weekly Health Guides & Resources

Trimester Guide

Second Trimester Guide

Read comprehensive clinical milestones, screening checklists, and developmental guidelines for this phase.

Explore Trimester →
Common Symptoms

Track & Relieve Symptoms

Learn why symptoms occur, home remedies, and clinical indicators for this week:

Pregnancy Nutrition

Food Safety Checklists

Verify safety statuses, listeria and mercury risks, and safe alternatives for:

Full Nutrition Guide →

Frequently Asked Questions: Week 17

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