Skip to main content

The Pregnancy Hub

40 weeks pregnant

Get to know your growing baby and the changes you may be feeling.

Choose your week

Week 40

Know your due date?

Enter the due date from your care team to find your estimated week today. Your date stays in this browser tab.

Illustration of a pumpkin

Third trimester

About the size of

a pumpkin

Approximate length

20.2 in / 51.2 cm Head to heel

Your baby

Your baby should continue moving in their usual pattern, even though there is less room inside the uterus. Movements should not slow down or stop because the due date has arrived. Contact your maternity care team right away about a change. The pumpkin comparison gives an approximate length, not your baby's measured size or a reason to judge growth at home.

Your body

Waiting can bring excitement, frustration, discomfort or all three. Practice contractions may continue, but symptoms alone cannot reliably tell you when labor will begin. Rest when you can and keep asking for help with symptoms that concern you. Do not assume that a new or severe symptom is expected simply because you are at the end of this guide.

This week

Planning the next steps while you wait

A due date is an estimate, and your care continues if pregnancy goes beyond it. Confirm the date of your next assessment and the plan for monitoring you and your baby. Ask when induction is recommended in your circumstances, what it involves, and the benefits and risks of waiting or proceeding. This guide ends at week 40; that does not replace ongoing care or mean you should wait without a plan. Keep your maternity contact details available, and seek advice promptly about movement changes, leaking fluid, bleeding or possible labor.

Explore birth preparation

Looking ahead

A question for your next visit

What happens next if labor does not start, and when should we discuss monitoring or induction?

Browse pregnancy weeks

A little context for these comparisons

These are approximate sizes for each week, not measurements of your baby. Babies and produce both come in different sizes, and the illustrations are not shown to scale.

Before week 20, length is measured from head to bottom. From week 20, it includes the legs, from head to heel. That change explains the jump in length between weeks 19 and 20.

When to get help

If your baby’s usual movements slow down, stop, or change, contact your maternity care team right away.

Seek medical care right away for warning signs such as a severe or persistent headache, vision changes, chest pain, trouble breathing, severe belly pain, vaginal bleeding, leaking fluid, or thoughts of harming yourself or your baby. These are examples, not a complete list. If you cannot reach your care team, seek urgent medical care. Call 911 for a medical emergency.

Read the CDC urgent maternal warning signs (opens in a new tab)
About this guide

Approximate measurements and development information draw on the NHS weekly guides. Linked US health resources support care and preparation topics. The topics are suggestions for discussion, not a schedule of required appointments or tests. Your own care plan may differ.

Every pregnancy is different. Your care team can help you understand your baby’s growth and any symptoms you’re experiencing.