Week 39

Your baby is fully cooked

Your baby’s the size of a mini watermelon, and likely engaged in your pelvis, ready to meet you soon.

A depiction of a baby at 39 weeks, about the size of a mini watermelon, curled and peaceful.

Baby's size this week

About the size of

a mini watermelon

Length
19.9 in (50.6 cm)
Weight
7.24 lb (3.29 kg)

About the size of a mini watermelon, your baby’s likely snugly engaged in your pelvis, ready for their grand entrance.

Sophie reads you this week

A short note, out loud·1:12

What to expect

Your baby’s fully cooked. At 39 weeks, they’re considered full-term and more than ready to make their debut. Their brain is still developing rapidly, and they’re packing on a little more fat to keep them warm outside the womb.

Engagement is common. Many babies have dropped into the pelvis by now, often called being ‘engaged’ or ‘lightening.’ This can give your lungs more room to breathe but might increase pressure on your bladder and pelvis. You might notice a change in your belly’s shape, too.

Patience is key. While it’s tempting to want to hurry things along, most babies arrive when they’re ready. Focus on staying calm and preparing mentally and physically for labor. Rest when you can, your body will need the energy.

  • Brain growth. Your baby’s brain is developing rapidly, forming connections that will support learning and memory.
  • Fat stores. They’re adding those final layers of fat to help regulate body temperature after birth.
  • Movement changes. You might feel fewer kicks and more rolls or stretches as space becomes tight.

Things to be aware of

Braxton Hicks contractions. These ‘practice’ contractions might feel more intense now. They’re typically irregular and don’t lead to labor, but if they become consistent and closer together, it could be the real deal.

Mucous plug loss. Losing your mucous plug is a sign that your body’s preparing for labor, but it doesn’t always mean labor is imminent. It can happen days or even weeks before active labor begins.

Swelling and discomfort. It’s common to experience swelling in your feet, ankles, and hands. Elevating your legs and staying hydrated can help ease this. Sharp pelvic pain or pressure is also normal as your baby settles lower.

What might happen

Your due date’s approaching. While only about 5% of babies arrive on their exact due date, it’s a helpful milestone. Many providers will discuss induction options if you go past 41 weeks, but every pregnancy is different.

Final appointments. You’ll likely have weekly checkups now to monitor your baby’s position, your cervix’s progress, and any signs of labor. These appointments are a good time to ask any last-minute questions.

Labor signs. Keep an eye out for consistent contractions, your water breaking, or a bloody show. If you’re unsure whether you’re in labor, don’t hesitate to call your provider, it’s always better to check.

  • Pack your hospital bag if you haven’t already
  • Discuss birth preferences with your provider
  • Prepare snacks and hydration for labor

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