Pregnancy Week 12

Read about how your baby is developing in week 12 and how to deal with sleep issues, nosebleeds, and more.

Week by week baby size image. Week by week baby size image.

How big is baby?

Your baby is almost three inches long now, about the size of a lime. Fingernails, toenails, and bones are forming, and a fine layer of hair covers most of her body.

Baby's Length: 2.13in.
Baby's Weight: 0.49oz.
Fetus at Week 12 What the baby looks like at week 12 of fetal development. Med ART Studios Explore More

Baby's Development

As your baby's muscles start to bulk up at this stage, he's getting busy stretching and kicking. When you put your hand on your belly, your baby will likely wiggle in response because his reflexes are starting to develop -- though it's too early to feel his movements. He'll also start to open and close his fingers, curl his toes, and jerk and kick his arms and legs.

Baby Week 12

Close
The fetus is beginning to demonstrate reflexes like grasping, sucking and even hiccups, although these activities are not yet able to be felt by the mother.Now weighing approximately ½ ounce, the developing fetus is about the size of a key lime.Your uterus is now about the size of a small melon and has begun to move forward towards your navel. This may cause your belly to protrude.
Week by week baby ultrasound image. Week by week baby ultrasound image. American Institute of Ultrasound in Medicine - AIUM.org

Week 12 Ultrasound

With the baby in profile and the head on the right side, you can see that the facial profile is becoming more and more like what you'd expect to see in a newborn. The developing baby has one hand in front of the face as if he's shading his eyes.

Read More

Watch Baby's Growth

Embryo to Fetus: Weeks 9 to 12 of Pregnancy

Mom's changing body

Until now, your uterus has fit snugly within your pelvis. But as it begins to move north this week, the pressure on your bladder should start to let up a bit. This also means your belly has the room to swell, giving you that slightly rounded, "Yes, I'm pregnant!" look. And if your world is a little blurrier than usual, don't be alarmed. The extra fluid your body retains during pregnancy may also thicken your lens and cornea (the outermost layer of your eye), and the pressure of the fluid within your eyeball may change as well. Together, these changes can cause blurry vision. Your peepers should self-correct within two months of your baby's birth, but let your doctor know about your eye symptoms, as they could also signal hypertension or diabetes.

Weekly Tip

Many couples decide to break the news around the end of the first trimester. If you're not ready to spread the word yet, start thinking about how you'll spill the beans and get ready to tell your boss that you're pregnant. Handle it like any other important discussion: Set up a one-on-one -- and be prepared. Know your company's maternity leave policy beforehand. Reassure her that you'll be on top of things until you leave, that you'll help train whoever will be taking over your responsibilities, if possible, and that you'll be back at your desk before she knows it. Whatever you do, don't apologize or feel guilty for taking the time off that you deserve.

Pregnancy Confidential Podcast

Hi, Boss. I'm Pregnant!

It's Week 12 and you've made it to the last week of your first trimester. Congrats! It's an exciting milestone because it means your miscarriage risk drops significantly, your troublesome first trimester symptoms should start to subside, and you can start to breathe easier in this pregnancy—it's also around when a lot of people start thinking about telling the world. But before you blast the news on Facebook, you'll want to tell your boss, so they aren't the last to find out after Dave in accounting. This week's episode covers everything you need to know about being pregnant at work—from the big reveal to planning for your maternity leave (which may feel a million years from now but will come up sooner than you think).

This Week's To-Do List

Must-Reads

Embryo to Fetus: Weeks 9 to 12 of Pregnancy

You're well into your first trimester at this point, and your baby is growing bigger and bigger each day. Watch what it takes for her to become a fetus.

Pregnancy Travel Guide

Follow our trimester-by-trimester guide to safe and comfortable travel during pregnancy.

The Inside Story: Your Baby in Week Twelve

Baby is three inches long this week! Find out more about her growth and development during your 12th week of pregnancy.

Financially Preparing for a Baby

You won't believe how much it costs to raise a child!

Your Developing Baby: Week 12

What's going on with your baby in pregnancy week 12? Find out all about important pregnancy milestones and exciting fetal development specific to this week of pregnancy!

Pregnancy Sex Tips: Fun Sex in Your First Trimester

Will sex be any different now that you're pregnant? Find out how to keep your sex life fun.