6 Weeks Pregnant
You’re 6 weeks pregnant — in the first trimester, and 34 weeks to go until your due date. Your baby is about the size of a lentil this week.
★ The heartbeat begins.
How big is your baby at 6 weeks?
Size of a
lentil
Length
~0.6 cm
Weight
—
Last week your baby was about the size of a sesame seed; this week it's grown to roughly a lentil.
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 6
A major milestone: the heart is now beating, often visible as a flicker on an early ultrasound at around 100–160 beats per minute. Tiny buds that will become arms and legs appear, and the face begins to take shape with dark spots marking where the eyes will be. The embryo has a distinct C-shaped curve and is roughly the size of a lentil.
Your body at 6 weeks
Common symptoms many people notice around week 6 include:
- Nausea and vomiting may intensify
- Strong fatigue
- Sore breasts and darkening areolas
- Mood swings from hormonal shifts
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 6
- Try ginger or vitamin B6 for nausea (check doses with your provider)
- Stay hydrated, especially if vomiting
- An early ultrasound may detect the heartbeat around now
What trimester is 6 weeks?
Week 6 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 6 weeks pregnant?
- 6 weeks pregnant is about 2 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 6 weeks?
- At 6 weeks, the baby is about the size of a lentil, roughly 0.6 cm. These are averages — healthy babies vary, and your provider tracks your baby's own growth curve at scans.
- What trimester is 6 weeks?
- Week 6 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).