9 Weeks Pregnant
You’re 9 weeks pregnant — in the first trimester, and 31 weeks to go until your due date. Your baby is about the size of a grape this week.
★ The embryo becomes a fetus.
How big is your baby at 9 weeks?
Size of a
grape
Length
~2.3 cm
Weight
~2 g
Last week your baby was about the size of a kidney bean; this week it's grown to roughly a grape.
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 9
The embryo officially becomes a fetus at the end of this week. The essential organs are in place and now begin maturing. Tiny muscles are forming, allowing the first small movements, and the heart has divided into four chambers. The face continues to refine, with eyelids formed and the tip of the nose visible. About the size of a grape.
Your body at 9 weeks
Common symptoms many people notice around week 9 include:
- Nausea may be at its peak
- Mood swings
- Tender breasts that may have gone up a cup size
- Heightened sense of smell
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 9
- Eat what stays down — this phase passes for most by the second trimester
- Keep prenatal appointments; the dating scan confirms your due date
- Light exercise approved by your provider helps energy and sleep
What trimester is 9 weeks?
Week 9 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 9 weeks pregnant?
- 9 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 9 weeks?
- At 9 weeks, the baby is about the size of a grape, roughly 2.3 cm and around 2 g. These are averages — healthy babies vary, and your provider tracks your baby's own growth curve at scans.
- What trimester is 9 weeks?
- Week 9 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).