13 Weeks Pregnant
Summary
Size
peach
Length
7.4 cm
Weight
23 g
Until due date
27 weeks
13 / 40 week
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What's Happening With Your Baby
Fingerprints are forming. The vocal cords are developing. The baby produces urine and releases it into the amniotic fluid. Bone marrow begins making blood cells.
What's Changing For You
You're on the threshold of the second trimester. Nausea has largely passed for most women. Your belly may start to show clearly.
To Do This Week
Plan your maternity-clothes shopping now; tight trousers restrict circulation.
Track your weight gain with your doctor — it picks up pace in the second trimester.
An ideal time to build an exercise routine: aim for 150 minutes a week at moderate intensity.
Frequently Asked Questions
How many months is 13 weeks pregnant?
Week 13 of pregnancy falls in month 3 and in the first trimester. Pregnancy months don't run in neat four-week blocks, so the week-to-month conversion rarely lands on a whole number — which is why pregnancy is tracked in weeks.
How big is the baby at 13 weeks?
At 13 weeks your baby is roughly the size of a peach: around 7.4 cm long and 23 grams. These are averages; clear variation between babies is normal, and what matters is the growth curve your doctor is tracking.
How long is left at 13 weeks pregnant?
Assuming a 40-week pregnancy, you have around 27 weeks left at week 13. Most births happen between weeks 37 and 42, so a due date is a range rather than a fixed day.
What should I watch out for at 13 weeks?
Plan your maternity-clothes shopping now; tight trousers restrict circulation. Track your weight gain with your doctor — it picks up pace in the second trimester. An ideal time to build an exercise routine: aim for 150 minutes a week at moderate intensity.
Track your pregnancy week by week
Baby Wallie brings your baby's weekly development, your health logs and AI-powered nutrition, sleep and breathing programs into one app. Free for 7 days.
Related Guides
When To Seek Care Immediately
Whatever week you are in, contact your doctor or the nearest health facility without waiting if you have: vaginal bleeding or fluid loss, severe persistent abdominal pain, a severe headache, blurred vision or flashing lights, sudden swelling of the hands or face, a fever above 38 °C, burning on urination with fever, persistent vomiting, fainting, or — after week 28 — a clear reduction in your baby's movements. In these situations reach real medical care rather than an app or a web search.
This content is for informational purposes only and does not replace medical advice. Always consult your doctor or midwife about your own or your baby's health.