Skip to main content

The Pregnancy Hub

28 weeks pregnant

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

Choose your week

Week 28

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 eggplant

Third trimester

About the size of

an eggplant

Approximate length

14.8 in / 37.6 cm Head to heel

Your baby

Your baby continues growing and maturing as the third trimester begins. The nervous system and lungs still have development ahead, and the body is building reserves for life after birth. The eggplant comparison gives a sense of length, not a personalized growth assessment. Your prenatal team interprets growth and other findings together over time.

Your body

Heartburn, back discomfort and interrupted sleep can become more noticeable as your bump grows. Talk about symptoms that are limiting daily activities instead of assuming you must simply put up with them. A severe or persistent headache, vision changes or sudden marked swelling needs prompt medical attention, even if you have otherwise been feeling well.

This week

Beginning the third trimester

Ask your team what to expect from third-trimester visits and which symptoms should trigger a call between appointments. Review how they want you to pay attention to your baby's movements and what contact number to use if the usual pattern changes. Do not wait for a scheduled visit if movements slow, stop or change. Also confirm how recent screening results fit into your care plan. Writing down the next appointment, any outstanding results and the urgent contact route can turn a long list of pregnancy information into a manageable plan for the coming weeks.

Explore prenatal care

Looking ahead

A question for your next visit

What should I watch for between visits, and how do I contact the team with an urgent concern?

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.