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The Pregnancy Hub

16 weeks pregnant

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

Choose your week

Week 16

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 an avocado

Second trimester

About the size of

an avocado

Approximate length

4.6 in / 11.6 cm Head to bottom

Your baby

The developing nervous system supports more arm and leg movement. Your baby's hands can close into fists, and facial movements are appearing. These movements are part of development rather than expressions of an emotion you can interpret. Many people still cannot feel their baby move at this stage, even though movement is taking place.

Your body

Your bump may become more noticeable, and digestion or sleep may still be unsettled. The timing and intensity of these changes vary. Tell your care team about symptoms that are new, persistent or affecting your day. A brief note of what happens, how long it lasts and what makes it better or worse can help you describe it clearly.

This week

Organizing upcoming care

Look over your appointment and test information before the next visit. Are there results you have not discussed, screening decisions still to make or imaging appointments to arrange? Ask what each next step is for and whether timing matters. If work, transportation, cost or childcare makes attending difficult, say so early so the team can discuss options. Do not assume a missing call means a result is normal; ask how results are communicated and whom to contact if you have not heard back. Your plan may differ from a friend's even at the same pregnancy week.

Explore prenatal care

Looking ahead

A question for your next visit

Which results and upcoming tests should we review, and how will I receive follow-up information?

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

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.