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The Pregnancy Hub

23 weeks pregnant

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

Choose your week

Week 23

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 large mango

Second trimester

About the size of

a large mango

Approximate length

11.4 in / 28.9 cm Head to heel

Your baby

Your baby's arms and legs are now in proportion with the body, and movements may be becoming easier to recognize. Over time, you may notice times when your baby is more active. This is about learning your own experience, not comparing the strength or frequency of movements with another person's pregnancy.

Your body

Your rib cage and breasts may feel different as your body changes. Some people notice a little early milk, called colostrum, while others do not. These changes do not establish how feeding will go after birth. If breast or rib discomfort concerns you, describe where it occurs and whether it affects breathing, rest or movement so your clinician can assess it appropriately.

This week

Knowing whom to call about movement

Save the number your maternity team wants you to use for urgent concerns, including outside normal office hours. If your baby's usual movements slow down, stop or change, contact the team right away; do not wait until the next day or your next visit. Ask for guidance if you are unsure what you are feeling. A weekly guide, a scheduled future scan or reassurance from someone else's experience should not replace an assessment of a change you notice. At a routine visit, clarify the contact plan before you need it.

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Looking ahead

A question for your next visit

Which number should I use for a movement concern during the day or outside office hours?

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.