Week 13 of 40 First Trimester

Week 13: Welcome to the Second Trimester (Almost)

You're at the very end of the first trimester, and your baby's vocal cords are starting to form this week.

Baby is the size of
Peach
7.4 cm
23 g
33% through your pregnancy
Week 12 All Weeks Week 14
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Baby's Development

Your baby's vocal cords are beginning to form, though obviously no sound will be heard for a long time yet. Fingerprints are forming on those tiny fingertips, and the placenta is now fully developed and functioning as your baby's life-support system.

Baby's body is becoming more proportional, with the head no longer looking quite so oversized compared to the rest of the body.

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Changes in Your Body

Congratulations on nearly reaching the second trimester! For many women, this marks the start of feeling noticeably better — more energy, less nausea, and an emerging baby bump.

Your uterus is about the size of a grapefruit and continuing to rise out of the pelvis.

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Common Symptoms

As you transition toward the second trimester:

  • Nausea often continues easing
  • Energy levels frequently improve
  • A visible bump may start appearing
  • Increased appetite
  • Continued frequent urination, though sometimes slightly less intense
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Nutrition This Week

With your appetite likely improving, focus on balanced meals with plenty of protein, healthy fats, and complex carbohydrates to support your baby's continued rapid growth in the weeks ahead.

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Safe Exercises

The second trimester is often considered the most comfortable time to be active during pregnancy for many women. If you've been holding back due to nausea, this can be a good time to build a sustainable routine.

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Medical Checklist

Heading into the second trimester:

  • Review your first-trimester screening results with your doctor if applicable
  • Ask about the anatomy scan timeline (usually around 18-22 weeks)
  • Continue prenatal vitamins and healthy habits
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Doctor Visit Guide

If you had first-trimester genetic screening, your results should be available around now — your doctor will discuss what they mean and any recommended next steps, if any.

Frequently Asked Questions

Trimester boundaries vary slightly by source — some consider week 13 the last week of the first trimester, others mark week 14 as the true start of the second. Either way, you're right at this transition point.

For most women, yes — the second trimester is often described as the most energetic and comfortable phase of pregnancy, though every pregnancy is different.
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