12 Weeks of Pregnancy

At 12 Weeks of Pregnancy, your uterus will have expanded to the size of a pineapple, and your unborn child will have graduated from the status of a fetus to that of a fetus with its own beating heart. When you are twelve weeks pregnant, you may experience some shifts in your morning sickness as well as fatigue. Stay calm; by the 20th week, you’ll start to feel like you’re getting closer to the point where you’ll be halfway to your due date.

Your child is approximately 6 centimeters long, or about the size of a plum, and weighs approximately 18 grams. Within the past four weeks, the size of the fetus has almost doubled, and it is now completely formed, with all of the organs, muscles, limbs, and bones in their proper places. At this point, your baby will have completely filled out your uterus. The length of the head is approximately equal to that of the body.

12th Weeks Of Pregnancy

At 12 weeks pregnant, you should be feeling certain things, and this guide will help you understand what those feelings are. These symptoms can differ from one individual to the next, as well as from one pregnancy to the next. Your journey through the first 12 weeks of pregnancy will probably involve a number of highs and lows, but try not to worry about it too much because many women report feeling better in the second trimester!

Feeling fatigued? Afraid of getting the dreaded morning sickness? When you are 12 weeks pregnant, you might feel shifts like these as well as other changes.



This is a big week for your baby: Your little one’s key body systems and vital organs are now fully formed! If you haven’t already, you’ll be able to hear your baby’s heartbeat at your next prenatal checkup.

Meanwhile, at 12 weeks pregnant, your baby bump may be looking a little more pronounced.

Your Baby at Week 12

1:48Your Pregnancy Week 12Don’t have headphones?

View video transcript. 

At a Glance

The big moveDuring week 8, your baby’s intestines were infringing on umbilical cord space. But this week, they’re completing the move back into the abdomen.

Future grandparent?Your baby’s pituitary gland at the base of the brain has begun producing hormones, meaning your little one could give you grandchildren one day.

Germ fighterYour baby’s bone marrow is making white blood cells, so she’ll be able to fight off all those germs passed around the playground.

12 weeks pregnant is how many months?

If you’re 12 weeks pregnant, you’re in month 3 of your pregnancy. Only 6 months left to go! Still have questions? Here’s some more information on how weeks, months and trimesters are broken down in pregnancy.

How big is my baby at 12 weeks?

By now your baby weighs a full half-ounce, with a crown-to-rump length of 2 to 2¼ inches: about the size of a lime.

It’s hard to believe — especially from the outside, since you’re probably barely showing at this point — but your baby has more than doubled in size during the past three weeks.

Baby’s digestive system begins working

This week marks a turning point for your baby. At 12 weeks pregnant, the Herculean task of developing new bodily structures is nearing an end, as most of your baby’s systems are fully formed — though there’s still plenty of maturing to do.

Now comes the maintenance phase, during which your fetus’ systems continue to evolve for the next 28 weeks and the organs get to work. For one thing, the fetal digestive system is beginning to flex its muscles — literally — as it starts practicing contraction movements, a skill your little peanut will need after birth to push food through the digestive tract.

The bone marrow is busy making white blood cells — weapons that will one day help your baby fight infection once she’s out of your safe haven and in a regular play group. And the pituitary gland at the base of the brain has started producing the hormones that’ll enable her to make babies of her own in a few decades or so.

Fetal heartbeat

If you haven’t already had the pleasure, it’s likely that at this month’s checkup you’ll finally hear your baby’s fetal heartbeat — a sound that will make your heart race with joy!

Your Body at Week 12

baby size at 12 weeks pregnant

The end of some pregnancy symptoms

As you near the end of your first trimester, your uterus, now about the size of a large grapefruit, begins to migrate from the bottom of your pelvis to a front-and-center position in your abdomen.

If you’re lucky, this will bring an end to one pesky early pregnancy symptom: the constant urge to urinate.

Also slated to diminish somewhat now that you’re on the cusp of your second trimester are some of those other early pregnancy symptoms: nausea, super tender breasts and nipples, food aversions and fatigue.0:42How Big Are 12-Week Bumps?

Your 12 weeks pregnant belly

At 12 weeks, your baby bump may be more pronounced and may even show to the outside world. But it’s just as likely that while your clothes may be getting a little tight, you won’t yet have a noticeably pregnant belly at this point. If anything, you may look like you’ve gained a little weight around the middle, or you may not look different to anyone else at all.

Whatever the case may be, know that your 12 weeks pregnant belly is completely normal, whether it’s on the bigger, smaller or invisible side. Baby bumps can vary widely depending on the woman’s size and shape and whether this is a first or subsequent pregnancy.

So don’t fret if your bump at 12 weeks doesn’t look like your pregnant friend’s at the same stage. All bumps are beautiful! If you’re not showing yet, you will be in time, and if you are showing quite a bit, that’s fine too. You can always talk to your practitioner if you have any concerns.

Dizzy spells

Once you hit your second trimester, there’s a new pregnancy symptom that may be added to the mix: dizziness. And guess who’s to blame? Yup — it’s your old friend progesterone again, which causes your blood vessels to relax and widen around 12 weeks pregnant, increasing the flow of blood to your baby (again, good for baby), but slowing the return of blood to you (as always, not so good for mom).

What that means for you is lower blood pressure and reduced blood flow throughout your body, including to your brain. These factors can contribute to that light-headed, dizzy feeling — especially when you get up too quickly — which is why slow and steady wins the race here.

Another cause of dizziness during pregnancy is low blood sugar levels, which can occur if you’re not eating regularly. So don’t try to run…or even walk…on empty.

Here’s a quick tip: If you feel dizzy or faint, lie down or sit with your head lowered between your knees, take deep breaths and loosen any tight clothing — like that button on your jeans you struggled to close in the first place. As soon as you feel a little better, get something to eat and drink.

Low sex drive

Your best friend says being pregnant has seriously boosted that good old libido — but you aren’t feeling any friskier. What’s the deal with your decreased sex drive?

Hormones hit every woman differently, meaning a spike in sex drive for some and a damper on it for others. Pregnancy symptoms can also stand between you and a good time — after all, it’s hard to get in the mood when you’re queasy, tired or constipated (or all of the above and then some!).

Rest assured, whatever you’re feeling is normal. Just stay emotionally connected with your partner and remember that many women have ups and downs in sex drive throughout pregnancy. So you may be in for a warmer spell soon.

Pregnancy Symptoms Week 12

Increased sense of smell

Fewer frequent bathroom trips

Occasional headaches


Bloating and gas

Excessive saliva

Tips for You This Week

Get your flu shot

All pregnant women are with child sometime during flu season, October to May, which is why the Centers for Disease Control and Prevention (CDC) recommends that all moms-to-be get the flu shot. And being pregnant doesn’t up your risk for shot side effects, notes a recent study.Embrace loose styles

Your doctor can feel your growing uterus by touching your abdomen, but your belly may not be sporting a bump. Until you’re ready for maternity wear, shop for looser or stretchy clothes, like empire-waist maxi dresses, drawstring pants and lightweight sweaters.Start doing Kegels

Pushing your baby through your pelvis and into the world is demanding not only on you, but also on your pelvic floor muscles — which have to stretch to proportions previously unimaginable.

Doing pelvic floor exercises can ease pregnancy symptoms and lead to a faster post-birth recovery. Squeeze the pelvic floor muscles for up to 10 seconds, shooting for three sets of 20 a day.

Building these bladder- and uterus-supporting muscles reduces your chance of bladder issues and eases a host of other pregnancy and postpartum symptoms.Steer clear of alcohol

The warning labels on the sides of beer, wine and alcohol bottles are there for a reason. Drinking alcoholic beverages during pregnancy can have serious consequences for your baby, including birth defects and complications.

Even moderate drinking can cause problems, so it’s best to abstain entirely until after delivery. Don’t worry, however, if you had a couple of drinks before you found out you were pregnant.Rethink hair removal

Shaving might be a cinch right now, but as your pregnancy progresses, you might have trouble seeing below your belly or keeping your balance. While a shower can soften your hair and skin, making it easier to remove, always shave after you’ve finished, since a slip-up could be serious.

If your skin isn’t too sensitive, you might want to try waxing and sugaring (ask your doctor if it’s okay first), which is a long-term solution to unwanted hair.

As for bleaches and hair removal creams and lotions, the jury is still out on whether they’re safe to use during pregnancy, so consider shelving them until after you give birth.Stay hydrated

Here’s one bottle you need to be hitting: the water bottle. It’s more important than ever to stay hydrated now, so plan on adding an extra glass of liquid for every half hour of activity — and no cheating…it should be an 8-ounce glass.

Stick to water when possible — sports drinks contain too many ingredients you just don’t need. Take in even more in warm weather or when you’re just plain sweating a lot.Know which foods to avoid

Fortunately, you don’t have to worry about finding unpasteurized milk at the supermarket, thanks to the Food and Drug Administration (FDA).

But you can run across soft cheeses that have been made with unpasteurized milk — and those can harbor listeria and other pathogens.

To stay safe, don’t nosh on feta, Brie, Camembert, goat cheese, blue-veined cheeses and queso fresco unless you’re positive they’re made with pasteurized products. Always check the label to make sure.

For a safer alternative, stick with hard cheeses (like Swiss and cheddar) or heat up soft cheeses until bubbly.

12 Week Of Pregnancy Symptoms

Your baby is as big as a lime.

12 Weeks Pregnant

Things are changing fast at 12 weeks pregnant. You’re reaching the home stretch of the first trimester (we know, finally!), which means your hormones are likely to tone things down a bit—hopefully making you feel fewer early pregnancy symptoms. It also means you may be ready to share your pregnancy news with family and friends. So exciting!

How Big Is Baby at 12 Weeks?

At 12 weeks pregnant, baby is as big as a plum. The average 12-week fetus is about 2.1 inches long and .49 ounces. Now that baby’s got pretty much all of their important organs, their main job is to keep on growing. Go, baby, go!

12 Weeks Pregnant Is How Many Months?

At 12 weeks pregnant, you’re about three months pregnant. Remember, pregnancy is 40 weeks long, which doesn’t break down cleanly into nine months. Just two more weeks until you can officially put your first trimester behind you!

3D Views: My Baby, My Body

See their progress for yourself with our 3D interactive tool.babySee My Baby in 3DmomSee My Body in 3D

12 Weeks Pregnant Symptoms

Here’s the good news about 12 weeks pregnant symptoms: Morning sickness and fatigue may start to fade a bit soon as your hormones start to calm down. The bad? Headaches and dizziness may replace them. We’ll take that trade-off. Here’s more info about what’s happening to your body at 12 weeks pregnant:

  • Increased discharge. This clear discharge might seem weird, but it’s normal and has an important purpose: to protect your vagina from infection. But if you have yellow, greenish, pink or brown discharge during pregnancy week 12, call your doctor right away. Those colors could be a sign of infection or even miscarriage.
  • Spotting. Spotting or bleeding during pregnancy at 12 weeks could be worrisome—or it could be nothing at all. For example, your cervix is more sensitive during pregnancy, so simply having sex could cause light bleeding that’s harmless. If you’re spotting or bleeding, definitely tell your doctor. If the bleeding is accompanied by cramping or the flow is heavy, it’s an urgent call.
  • Headaches. These may start to intensify around week 12 of pregnancy. Headaches may be caused by hormonal shifts, drops in blood sugar, dehydration, lack of sleep or stress. To deal, pay attention to what might be triggering your headaches and try to avoid those culprits. If you notice a drastic increase in headaches or a type of headache you’ve never experienced before (such as a migraine), or if your headaches are accompanied by other weird symptoms, let your OB know.
  • Dizziness. Whoa! Hormone shifts and blood pressure changes could cause dizzy spells around pregnancy week 12 (and sometimes even earlier!). You can help prevent dizziness by snacking regularly, avoid becoming overheated and drinking plenty of water. Sit or lie down if you’re feeling dizzy or lightheaded and let your doctor know about any severe bouts.

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If you’re 12 weeks pregnant with twins, you may still be experiencing morning sickness, while your singleton mom-to-be counterparts are likely starting to see the light at the end of the nausea tunnel. Know that things will likely improve soon.

What should I be feeling at 12 weeks pregnant?

Your body is working hard, and you may wonder, “what should I be feeling at 12 weeks pregnant?” You may not be showing much on the outside yet, but on the inside everything feels like it’s changing! In addition to typical 12 weeks pregnant symptoms, you may start to feel shifts with morning sickness and fatigue. One day you might be exhausted, and another you may feel a burst of energy, while nausea comes and goes. Hang tight—you’re getting closer to the second trimester! Make sure you get plenty of fluids and healthy foods for those days when morning sickness makes it rough to keep anything down.

12 Weeks Pregnant Belly

At 12 weeks, your pregnant belly is probably getting noticeable now. This is one reason many moms-to-be start to tell others they’re expecting around 12 weeks. (Of course, if you’re 12 weeks pregnant with twins, you may have been showing for weeks now, obviously because you’ve got double the babies in there!)

If you haven’t already, start taking photos of your pregnant belly at 12 weeks. Trust us, after pregnancy you’ll want a memento of how much your body changed throughout.

How does your stomach feel at 12 weeks pregnant?

You may already feel the waistband of your clothes getting tighter as your stomach begins to round out. When baby is at 12 weeks, your uterus is expanding to make room for your growing little one. This can also cause a tight feeling in your stomach itself as the stretching uterus puts pressure on the surrounding tissues of your body. Gas or constipation are other common causes of tummy troubles.

12 Weeks Pregnant Ultrasound

Your 12-week fetus is almost done developing their body’s important systems and parts, which means it’s all about getting bigger and more mature from here on out. Yep, baby’s about to enter the growth and maturation stage, in which organs and tissues will grow and develop rapidly.

Baby at 12 weeks is opening and closing their fingers and curling their toes, and their brain is developing fast!

Baby is now developing reflexes—if you poke your 12-week pregnant belly while looking at baby on an ultrasound, you’ll likely see movement. If you’re 12 weeks pregnant with twins, your twosome is developing at a similar rate as singleton babies at 12 weeks. Later on, they’ll have a slightly slower rate of growth.

You may have one more prenatal checkup before the end of your first trimester. Whether or not you have a 12-week ultrasound may depend on your doctor’s preference and maybe also on what your insurance covers. If you do get an ultrasound at this time, you’ll notice that you can see your 12-week fetus more clearly this time around, which may make you want to start spreading the news that you’re expecting.

Itching to find out if it’s a boy or a girl? We hate to be the bearers of bad news, but on a 12 weeks pregnant ultrasound, the sex isn’t usually revealed. Between 12 and 13 weeks is the very earliest a boy or girl could possibly be seen on an ultrasound, and the anatomy is still difficult to make out with any certainty. Your OB or technician is much more likely to be able to see baby’s sex at the mid-pregnancy anatomy scan, which will happen around week 20. However, if you received DNA blood testing for chromosomal disorders, you may find out baby’s sex when you get those results—if you want to know, that is!

Around week 12, you might want to know more about baby’s health, so you may have genetic testing done to determine the risk of birth defects or other problems. This can be a little scary—and confusing—so be sure to ask your OB plenty of questions, and know that it’s much more likely that baby is a-okay than anything else.

What does a 12-week fetus look like?

With the first trimester almost done, you may be wondering, “what does a 12-week fetus look like?” New and exciting changes are happening for baby at 12 weeks! The eyes and nose take shape, fingers and toes lose their connective webbing, fingernails develop, teeth buds crop up and organs such as the kidneys and intestines keep growing.

Tips for 12 Weeks Pregnant

Give sore breasts some TLC
Your body’s hormones are getting you ready for breastfeeding, which can make breasts sore or tender. Soothe pain by wearing comfortable clothes that don’t irritate the body, trading in underwire bras for maternity or nursing bras with soft support or using ice packs for temporary relief.

Wear sun protection
One 12 weeks pregnant symptom that can occur for many women is melasma, or the “ mask of pregnancy,” where dark spots appear on the face. It’s caused by those active hormones, but melasma can be made worse with sun exposure. Protect your skin with a mineral-based sunblock and a wide-brimmed hat, and stay in the shade or indoors during the day whenever possible.

Don’t give into junk food temptations
If your appetite starts to return as morning sickness fades, don’t feed it with lots of sugar, fats or processed foods. Healthy eating is good for you and baby, and it also helps you achieve a healthy weight gain moving forward. While it’s totally normal to not gain any weight in the first trimester (or even lose a few pounds), women of normal pre-pregnancy weight should plan on adding a pound or two a week during the second trimester

Think about getting physical
Pretty soon, you’ll have more energy, so make sure to talk with your OB about a safe exercise plan for the rest of your pregnancy. Regular workouts may help manage weight gain, make your heart and lungs strong, decrease pain and potentially reduce risk of issues such as gestational diabetes.

Pregnancy Checklist at 12 Weeks Pregnant

Reminders for the week:

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