My Baby - Week by Week Pregnancy
Week 31 - Can Distinguish Between Light and Dark
Your baby now weighs approximately 3.5 pounds, measures just over 16 inches from head to heel, and is getting used to the world of light and dark by opening and closing its eyes. Its facial muscles continue to strengthen, and your baby can make different expressions. His or her lungs are nearly mature; however, these last few weeks are crucial to healthy and complete lung development.
See a baby at 31 weeks: Ultrasound image at 31 weeks
How is your body changing this week? Find out: My Pregnant Body Week 31
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