13 Weeks Pregnant
At 13 weeks pregnant your baby is about the size of a lemon. You are in the second trimester, and this week brings its own small changes — for your baby and for you.
Welcome to the second trimester.
- Size of
- a lemon
- Length
- 7.4 cm
- Weight
- 23 g
- Trimester
- 2
Your baby this week
- Unique fingerprints form on the tips of the fingers.
- The external genitals are forming and may be visible on a later scan.
- Soft cartilage is slowly hardening into bone.
Your body this week
- Energy often returns as first-trimester hormones settle.
- A small bump becomes visible, especially by the end of the day.
Common symptoms
- A noticeably bigger appetite
- A blocked nose that has nothing to do with a cold
- Tender, heavier breasts
What to expect
The middle months are usually the steadiest part of pregnancy. Energy often returns, the bump becomes visible, and appointments settle into a routine. With 27 weeks to go, this is a good time to plan ahead while you feel well.
Tips for this week
- Switch to softer waistbands before your clothes become uncomfortable.
- Keep moving gently — a daily walk helps circulation, mood and sleep.
- Drink water through the day; dehydration worsens tiredness and headaches.
Frequently asked questions
How many months is 13 weeks pregnant?
13 weeks is about 3 months. Pregnancy months do not divide evenly into weeks, so counting in weeks is more precise.
How big is my baby at 13 weeks?
At 13 weeks your baby is around a lemon — roughly 7.4 cm long and about 23 g. Healthy babies vary a lot around these averages.
What symptoms are normal at 13 weeks pregnant?
The most common ones this week are listed above. Contact your doctor or midwife about heavy bleeding, severe pain, a fever, or any change in your baby’s movements.
Pregnancy weeks are counted from the first day of your last period, so week 1 begins before conception.
This article is for general information only and is not medical advice. Always talk to your doctor or midwife about your own pregnancy.