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At 13 weeks your baby is about the size of a lemon

First trimester · Weeks 4 to 13

13 Weeks Pregnant

Your baby is about the size of a lemon.

Length

2.9"

Weight

23 g

To go

27 wks

Week 4You are here · week 13Week 40

Your baby

What is developing at 13 weeks

Welcome to the last week of your first trimester. Your baby is roughly the size of a lemon, and the vocal cords are taking shape. The body is starting to catch up to the size of the head, and tiny bones are developing in the arms and legs.

Your body

What you may be feeling

Many people feel a welcome lift in energy this week as early pregnancy symptoms begin to fade. You might notice more visible veins as your body produces extra blood, and some increase in vaginal discharge, which is normal and helps protect against infection. Healthy discharge is clear, white, or creamy. Let your provider know if it changes color, smells unusual, or comes with itching or soreness. A little round ligament twinge as your uterus stretches is also common.

This week

Tips for week 13

This can be a nice moment to start thinking about how and when you would like to share your news. Begin looking into comfortable clothing options, since you may soon want a bit more room. Keep meals balanced with protein, whole grains, and produce to support steady energy.

Following along week by week?

Try our baby size tool, due date calculator, and food safety checker, and book your prenatal care with Garden OB/GYN across Brooklyn, NYC, and Long Island.

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About this guide

This page is general educational information, compiled from publicly available guidance from trusted medical sources, including the NHS and MedlinePlus. It is not medical advice from Garden OB/GYN or its providers, and it is not a substitute for care from your own clinician. Every pregnancy is different, so always talk with your OB/GYN about your specific situation. See our full medical disclaimer.