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The Pregnancy Hub

27 weeks pregnant

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

Choose your week

Week 27

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 cauliflower

Second trimester

About the size of

a cauliflower

Approximate length

14.4 in / 36.6 cm Head to heel

Your baby

Your baby is adding fat beneath the skin while organs continue maturing. The body gradually looks less wrinkled as that layer develops. Growth and maturity are not the same thing: gaining size does not mean every organ is ready for life outside the uterus. The weekly comparison cannot predict an individual baby's needs.

Your body

Bloating or constipation may become more noticeable. Fluids, fiber-containing foods and suitable activity can be useful topics to discuss if your digestion is uncomfortable. Ask for advice about persistent symptoms and check before using a laxative or supplement. It may help to describe your usual eating pattern and what you have already tried.

This week

Reviewing the plan for the third trimester

Use this week to review the next part of your care plan. Check that recent results have been explained and ask about upcoming appointments, blood tests or other assessments relevant to you. Discuss recommended vaccines and their timing using current US guidance, since recommendations can depend on the vaccine, season and your history. If you have been told you are Rh-negative, ask whether any follow-up is needed and when. You do not need to arrange every item on a generic pregnancy checklist; ask your clinician which parts apply to your own care and how you will be reminded.

Explore prenatal care

Looking ahead

A question for your next visit

What tests, vaccines or follow-up should we plan as I enter the third trimester?

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.