12 Weeks Pregnant
You’re 12 weeks pregnant — in the first trimester, and 28 weeks to go until your due date. Your baby is about the size of a lime this week.
★ End of the first trimester is near; miscarriage risk drops notably.
How big is your baby at 12 weeks?
Size of a
lime
Length
~5.4 cm
Weight
~14 g
Last week your baby was about the size of a fig; this week it's grown to roughly a lime.
Sizes are averages from standard fetal-growth references. Every baby grows at its own pace — your provider tracks yours at scans.
Baby development at week 12
Reflexes are developing — the fetus can curl its fingers and toes and may suck its thumb. The digestive system is starting to practise contractions, and the kidneys are producing urine into the amniotic fluid. Most major structures are formed; the rest of pregnancy is largely about growth and maturation. About the size of a lime.
Your body at 12 weeks
Common symptoms many people notice around week 12 include:
- Morning sickness easing for most
- A small baby bump may start to show
- Less frequent urination as the uterus rises out of the pelvis
- Visible skin changes like a darker line down the belly (linea nigra)
Symptoms vary enormously from person to person and pregnancy to pregnancy. Not having a symptom on this list is just as normal as having it.
Tips for week 12
- The 12-week scan (dating/nuchal translucency) typically happens now
- Many people choose to share their news after this scan
- Keep moving — approved exercise supports energy and circulation
What trimester is 12 weeks?
Week 12 falls in the first trimester. As a quick map: the first trimester runs weeks 1–13, the second covers weeks 14–27, and the third is week 28 through birth (a due date is set at 40 weeks). Want your own dates? Our Pregnancy Due Date Calculator shows your due date and exactly how far along you are today.
The first trimester (weeks 1–13) is when the baby's major organs and body systems form, and when pregnancy symptoms like nausea and fatigue are usually strongest. It's also when most prenatal care begins — the dating scan, early bloodwork, and (if you choose) genetic screening all happen in this window.
Frequently asked questions
- How many months is 12 weeks pregnant?
- 12 weeks pregnant is about 3 months. Pregnancy months don't divide evenly into 4-week blocks, so week-to-month conversions are approximate — most providers track pregnancy by week, not month.
- How big is the baby at 12 weeks?
- At 12 weeks, the baby is about the size of a lime, roughly 5.4 cm and around 14 g. These are averages — healthy babies vary, and your provider tracks your baby's own growth curve at scans.
- What trimester is 12 weeks?
- Week 12 is in the first trimester. The first trimester is weeks 1–13, the second is weeks 14–27, and the third is weeks 28 to birth (around week 40).