At 11 weeks pregnant you are about 2 1/2 months along, in the first trimester, with about 29 weeks to go until your estimated due date.
At 11 weeks pregnant your baby is officially a fetus, about 2 inches long by Mayo Clinic’s measure, and you may be deep in nausea, naps and screening decisions with no bump to show for it.
Every clinical detail was read in October 2026 on the primary sources named in the text.
Key Takeaways
11 weeks pregnant is about 2 1/2 months, or 9 weeks after conception (Mayo Clinic), with about 29 weeks to go.
Mayo Clinic puts the baby at about 2 inches (50 mm) crown to rump and about 1/3 ounce. Nemours KidsHealth compares it to a golf ball.
UPMC says nausea is usually worst around week 9 and often goes away in the second trimester.
MedlinePlus says cfDNA screening can start at week 10 and CVS may be done between weeks 10 and 13. Screening shows a chance, not a diagnosis.
Call for bleeding, cramping, severe vomiting or fever. Get emergency help for severe pelvic pain with bleeding, fainting or shoulder pain.
Table of Contents
11 Weeks Pregnant at a Glance
Quick Answer
At 11 weeks pregnant you are about 2 1/2 months along, in your 3rd month, with about 29 weeks to go. You are in the first trimester. Mayo Clinic says your baby is now called a fetus and may measure about 2 inches (50 millimeters) from crown to rump.
11 weeks pregnant
What to know
Trimester
First trimester on every definition we checked. UPMC, using ACOG’s definition, says it ends after 13 weeks and 6 days.
Month
About 2 1/2 months, so you are in your 3rd month. This counts 4 weeks and a few days per month. Months are a convention, not a medical unit.
Weeks to go
About 29 (40 minus 11, counted from the first day of your last menstrual period).
Baby’s size
About 2 inches (50 mm) crown to rump and about 1/3 ounce (8 grams), per Mayo Clinic. Nemours KidsHealth compares the baby to a golf ball or ping-pong ball.
Common symptoms
Nausea or vomiting at any time of day, tiredness, tender or swollen breasts, bloating and gas, peeing more often.
This week’s care focus
Your first or second prenatal visit, a likely first ultrasound, and a decision about genetic screening.
11 weeks pregnant: quick facts with sources.
How the weeks are counted. Mayo Clinic explains that your due date is set by counting ahead 40 weeks from the start of your last period, and that conception typically happens about two weeks after that period begins. That is why Mayo Clinic describes week 11 as the ninth week after conception.
Your dates can shift: Nemours KidsHealth notes that an ultrasound can help refine the date estimated from your last period. If your provider changes your due date, go by the new one.
Which trimester is 11 weeks? UPMC, using ACOG’s definition, says it runs until you have passed 13 weeks and 6 days. MedlinePlus says it continues through week 14. Either way, week 11 sits well inside it. See our first trimester guide.
Your Baby’s Development at 11 Weeks
Source and timing
What it says is happening
Mayo Clinic, week 11 (9 weeks after conception)
Your baby is now called a fetus. The face is broad, the eyes widely separated and the eyelids fused. Buds for future teeth appear, and red blood cells are beginning to form in the liver. By the end of the week, the outer genitals start developing.
Nemours KidsHealth, week 11
Bones are forming and the skin is see-through. The head makes up about half of the body length. The baby is starting to move, opening and closing fists and mouth, though you cannot feel it yet.
Mayo Clinic, week 12 (coming next)
Fingernails sprout, the face takes on a more developed profile and the intestines are in the abdomen.
Fetal development around week 11, by source.
Can you tell the sex yet? Not by looking. Nemours KidsHealth says boys’ and girls’ external genitals look similar until the end of week 11, and that doctors can usually tell them apart on ultrasound around 18 to 22 weeks. MedlinePlus notes that cell free DNA screening, a blood test that can be done from week 10, can also determine a baby’s sex.
How Big Is Your Baby at 11 Weeks?
Source
Week
Length
Weight
Mayo Clinic
11
About 2 inches (50 mm), crown to rump
About 1/3 ounce (8 g)
Nemours KidsHealth
11
Just over 1 1/2 inches (measurement type not stated)
See note below
Mayo Clinic
12
About 2 1/2 inches (61 mm), crown to rump
About 1/2 ounce (14 g)
Baby size near 11 weeks, by source.
Why the numbers differ. Mayo Clinic measures crown to rump, which leaves out the legs. Nemours KidsHealth does not say how it measures, and the weight it lists for this week is several times higher than Mayo Clinic’s, so we use Mayo Clinic’s weight here. Healthy babies vary, and your ultrasound measurements are the ones that matter for you.
A size comparison. Nemours KidsHealth compares your baby to a golf ball or ping-pong ball. UPMC adds that between weeks 10 and 13 the fetus grows from about one to three inches.
11 Weeks Pregnant Symptoms
Nausea and vomiting: Nemours KidsHealth says morning sickness can happen at any time of day or night. Mayo Clinic suggests small, bland meals every 1 to 2 hours, ginger, and cold, clear fluids.
Tiredness: Mayo Clinic says rising progesterone commonly causes it. Rest as much as you can and take a 15 minute daytime nap if possible.
Tender or swollen breasts: Mayo Clinic says the discomfort usually eases after a few weeks.
Bloating and gas: Nemours KidsHealth says digestion slows, which lets your body absorb more nutrients, so you may feel bloated or full.
Constipation: Mayo Clinic says progesterone slows digestion and the growing uterus can press on the bowels. It suggests fiber, plenty of fluids, less caffeine and staying active.
Heartburn: Mayo Clinic says hormones slow digestion and relax the valve between the stomach and esophagus. Try small, frequent meals and do not lie down right after eating.
Peeing more often: Mayo Clinic links it to increased blood volume. UPMC says cutting back on caffeine may help, but keep up your water.
Mood swings: Mayo Clinic says to see your provider if you feel sad or overwhelmed for more than two weeks.
When does the nausea ease? UPMC says morning sickness is usually worst around week nine and often goes away in the second trimester. Timing varies from person to person. UPMC notes that some people with hyperemesis gravidarum, a severe form, have symptoms until delivery.
When nausea is more than nausea. MedlinePlus says to call your provider for a significant amount of nausea and vomiting, and the CDC lists severe nausea and throwing up among its urgent maternal warning signs.
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The 11 weeks pregnant belly. None of the primary sources we read gives a week when a bump appears. What many people do notice at 11 weeks is a fuller, rounder middle by evening, and Nemours KidsHealth explains why: slower digestion can leave you bloated or full. A snug waistband right now is often bloating, not a bump.
Weight. Nemours KidsHealth says the usual recommendation is a gain of 25 to 35 pounds over the whole pregnancy, and that your provider may advise differently if you were overweight or underweight before pregnancy.
Prenatal Care, Tests and Appointments Around Week 11
UPMC says the first visit is usually around week 8, and the second visit, often between weeks 11 and 13, includes blood pressure, weight and urine checks plus your likely first ultrasound. If you have not had a first visit yet, Nemours KidsHealth says to book it this week or as soon as possible.
What
Window
Source
Prenatal visits
Every month in the first trimester
MedlinePlus
First ultrasound
In the first trimester, to estimate your due date; UPMC says often at the week 11 to 13 visit
MedlinePlus, UPMC
Nuchal translucency and first trimester blood test
An ultrasound of the back of the baby’s neck combined with a blood test
MedlinePlus
Cell free DNA (cfDNA, also called NIPT)
As early as the 10th week of pregnancy
MedlinePlus
Chorionic villus sampling (CVS)
May be done between weeks 10 and 13
MedlinePlus
Tests and screenings near week 11, as read in October 2026.
The 11 week ultrasound. MedlinePlus describes that screen as an ultrasound that measures the back of the baby’s neck (the nuchal translucency) combined with a blood test, and says the two together show whether the baby is at higher risk for Down syndrome.
Screening versus diagnostic tests. Nemours KidsHealth explains that some tests only show the chance of a problem, while others can diagnose one. MedlinePlus says cfDNA screening cannot tell you for sure whether your baby has a chromosome disorder, so a positive result means a higher chance, not a diagnosis, and other tests are needed to confirm or rule it out. Follow up tests include CVS (placenta tissue, weeks 10 to 13) and amniocentesis (amniotic fluid, usually weeks 15 to 20). MedlinePlus calls both very safe but notes a slight risk of miscarriage.
What cfDNA screens for. MedlinePlus lists Down syndrome, Edwards syndrome and Patau syndrome. Nemours KidsHealth suggests asking your provider about the risks and benefits of screening.
Prenatal vitamins. MedlinePlus says you will be given prenatal vitamins with iron if you are not already taking them; our guide to prenatal vitamins explains what to look for on the label.
What to Do This Week: A Simple Checklist
Book your first prenatal visit if it is not on the calendar yet (Nemours KidsHealth says this week or as soon as possible).
Write down your genetic screening questions: first trimester screening, cfDNA, both or neither, and what follow up testing would involve.
Keep taking your prenatal vitamin, and bring the bottle to your visit so your provider can review it.
Set up a nausea plan and add fiber and water each day (Mayo Clinic).
Take short walks if you can; UPMC suggests them, especially outdoors, for fatigue.
Save your provider’s after hours number and read the warning signs below.
Sleep at 11 Weeks Pregnant
First trimester tiredness is real: Mayo Clinic says rising progesterone commonly causes it.
Nap without guilt: Mayo Clinic suggests a 15 minute daytime nap if you can, and UPMC suggests afternoon naps.
Protect the hour before bed from heartburn: Mayo Clinic advises not eating or drinking for a few hours before bed and not lying down right after eating.
Ask before any sleep aid: check with your provider before taking any sleep medicine or supplement. Read can you take melatonin while pregnant before you reach for one.
Sleep position. None of the sources in this guide gives a sleep position rule for week 11. Ask your provider when they want you to start favoring your side. For later, our guide on how to use a pregnancy pillow walks through the options.
For Partners: How to Help at 11 Weeks
Take over the trash and run a fan while cooking if smells set off nausea (Mayo Clinic suggests both).
Come to the visit with the ultrasound if you can.
Learn the warning signs below so you can help make the call if she is unsure.
Looking Ahead: What Comes Next
Week 12: Mayo Clinic says fingernails sprout, the face takes on a more developed profile and the intestines are in the abdomen, with a baby about 2 1/2 inches crown to rump.
Week 13: the last full week of the first trimester on the ACOG definition used by UPMC. See 13 weeks pregnant.
Week 14: the first week of the second trimester on the ACOG definition used by UPMC, and UPMC says morning sickness often goes away in the second trimester. See 14 weeks pregnant.
Call your provider if you have any of these. MedlinePlus and UPMC list them for the first trimester:
Vaginal bleeding or spotting.
Cramping.
Severe nausea or vomiting.
Increased discharge, or discharge that is green, yellow or has an odor.
Pain when you pass urine.
A fever above 100.4 F, or chills.
Ectopic pregnancy warning signs. An ectopic pregnancy grows outside the uterus. Mayo Clinic says the first warning signs are often light vaginal bleeding and pelvic pain, and that if blood leaks from the fallopian tube you may feel shoulder pain or an urge to have a bowel movement. Mayo Clinic says to seek emergency medical help if you have:
Severe abdominal or pelvic pain with vaginal bleeding.
Extreme lightheadedness or fainting.
Shoulder pain.
Urgent maternal warning signs. The CDC’s Hear Her campaign says to seek medical care immediately for any of these during pregnancy:
A headache that will not go away or gets worse, or changes in your vision.
Dizziness or fainting, or a fever of 100.4 F or higher.
Trouble breathing, chest pain or a fast beating heart.
Severe nausea and throwing up.
Severe belly pain that does not go away.
Vaginal bleeding or fluid leaking.
Severe swelling, redness or pain of your leg or arm.
Overwhelming tiredness.
Thoughts about harming yourself or your baby.
The CDC says to tell the people caring for you that you are pregnant. If you have heavy bleeding, faint, or have severe pain, chest pain or trouble breathing and cannot get to care quickly, call 911. This article is general education, not medical advice.
Frequently Asked Questions
How many months is 11 weeks pregnant?
About 2 1/2 months, which puts you in your 3rd month, counting 4 weeks and a few days per month. You have about 29 weeks to go. Months are only a convention, which is why your provider counts in weeks from the first day of your last period.
How big is a baby at 11 weeks?
Mayo Clinic says about 2 inches (50 millimeters) from crown to rump and about 1/3 ounce (8 grams). Nemours KidsHealth says just over 1 1/2 inches and compares the baby to a golf ball or ping-pong ball. Sources measure differently, and healthy babies vary.
Can I have a baby bump at 11 weeks pregnant?
Some people notice a fuller middle, but the primary sources we read give no week when a bump appears. Nemours KidsHealth says slower digestion can make you feel bloated or full, so a tight waistband now is often bloating rather than a bump.
What happens at the 11 week ultrasound?
It is often your first scan. MedlinePlus says the first trimester screen pairs an ultrasound measurement of the back of the baby’s neck, called nuchal translucency, with a blood test to show whether the baby is at higher risk for Down syndrome. It is a screening test, not a diagnosis.
Is it normal for nausea to get better at 11 weeks?
It can be. UPMC says morning sickness is usually worst around week nine and often goes away in the second trimester, though timing varies from person to person. If a change worries you or comes with bleeding or cramping, call your provider.
Can you find out the gender at 11 weeks?
Not usually by ultrasound. Nemours KidsHealth says the external genitals look similar until the end of week 11 and that doctors can usually tell them apart around 18 to 22 weeks. MedlinePlus says cell free DNA screening, possible from week 10, can also determine a baby’s sex.
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