Skip to content

Health & Pregnancy

Font Size

Your Baby: Week 31

fetal development

Hotspot: 165,520

All major organ development is done, although baby's lungs are still immature.

Hotspot: 350,325

At this stage, your baby starts gaining weight rapidly.

Hotspot: 540,275

Baby will need plenty of nutrients -- weight doubles between now and birth.

Hotspot: 275,50

Measured from head to heel, baby is as long as a stalk of rhubarb -- 16.50 in.

WebMD Medical Reference

Pregnancy Week-By-Week Newsletter

Delivered right to your inbox, get pictures and facts on
what to expect each week of your pregnancy.

Today on WebMD

hand circling date on calendar
Track your most fertile days.
woman looking at ultrasound
Week-by-week pregnancy guide.
Pretty pregnant woman timing contaction pains
The signs to watch out for.
pregnant woman in hospital
Are there ways to do it naturally?
slideshow fetal development
pregnancy first trimester warning signs
What Causes Bipolar
Woman trying on dress in store
pregnant woman
Close up on eyes of baby breastfeeding
healthtool pregnancy calendar
eddleman prepare your body pregnancy