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The Pregnancy Hub

5 weeks pregnant

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

Choose your week

Week 5

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 sesame seed

First trimester

About the size of

a sesame seed

Approximate length

0.08 in / 0.2 cm Head to bottom

Your baby

The early brain and spinal cord are forming, and small blood vessels are developing. The placenta and umbilical cord will supply oxygen and nutrients and carry away waste. These systems take time to develop. Your baby's growth at this stage cannot be judged from how strong your symptoms feel or how closely you match a weekly illustration.

Your body

Tiredness, changing tastes and nausea may begin early, but there is no single way pregnancy should feel. A food you usually enjoy may suddenly be unappealing. Let your care team know if symptoms are affecting eating, drinking, sleep or daily life. Keeping a brief note of what happens and when can make that conversation easier than trying to remember everything during a visit.

This week

Reviewing medicines and supplements

Gather the names and doses of prescription medicines, over-the-counter products, herbal remedies and supplements you take. A photo of each label can help. Ask your clinician or pharmacist to review them for pregnancy, including products used only occasionally for pain, allergies or sleep. Do not stop prescribed treatment on your own: the condition being treated also matters. Confirm which prenatal supplement is appropriate and whether you need any individualized advice based on your health history.

Explore prenatal care

Looking ahead

A question for your next visit

Can we review everything I take, including occasional medicines, vitamins and herbal products?

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.