Pregnancy Week 17 — Baby Development, Size & What to Expect

Week 17 of pregnancy — 2nd trimester. Baby is the size of a pear 🍐, approximately 13.0cm long and weighing 140g. Fat stores developing. Baby can hear sounds outside the womb. 42% of the 40-week journey complete, 23 weeks remaining.

PREGNANCY WEEK 172nd TRIMESTER

🍐

pear

baby is about the size of a pear

WEEK

17

of 40

LENGTH

13cm

crown to rump

WEIGHT

140 g

approximate

Progress42% complete
Wk 12nd Trimester (Weeks 13–26)Wk 40

23 weeks remaining · Fat stores developing. Baby can hear sounds outside the womb.

WEEK 17 — BABY'S DEVELOPMENT

2ND TRIMESTER · Weeks 13–26

Fat stores developing. Baby can hear sounds outside the womb.

HOW YOU MAY FEEL

Round ligament pain possible. Baby may hear your voice now.

WEEK 17 KEY FACTS

Gestational age

Week 17

Trimester

2nd (T2)

Baby length

13cm

Baby weight

140 g

Progress

42% complete

Weeks left

23 weeks

FREQUENTLY ASKED QUESTIONS

What happens at week 17 of pregnancy?

At week 17 of pregnancy (2nd trimester):\n\nBaby development: Fat stores developing. Baby can hear sounds outside the womb.\n\nBaby size: pear 🍐\nLength: approximately 13.0cm (crown to rump)\nWeight: approximately 140g\n\nPregnancy progress: 42% complete (23 weeks remaining)\n\nGestational age is counted from the first day of your last menstrual period (LMP), not from conception. Week 17 begins on day 113 and ends on day 119 from your LMP.

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Pregnancy week 17 · 2nd trimester · Baby size: pear 🍐 · 13.0cm · 140 g · Sources: ACOG, WHO fetal growth data