Your Pregnancy Week by Week: Weeks 9-12

9 Weeks Pregnant

Baby: Your baby is about the size of a peanut: 0.70 inch. The head is more erect, and the neck is more developed. Your baby's skeleton is forming, but the bones are still soft. Little eyelids form but stay closed, and a nose appears. During an ultrasound, you might see how your baby moves, even though you can't feel it yet.

Mom-to-be: Your uterus is continuing to grow, and you may notice your waistline thickening. Unless you tell people your special news, however, your pregnancy still won't be noticeable to others. Pregnancy hormones slow digestion so your body absorbs more nutrients. This may lead to constipation or bloating. Hormones also relax the stomach and esophagus, which can cause heartburn. You probably won’t have gained much weight yet.

Tip of the Week: Eat plenty of foods that contain calcium, such as cheeses, sardines, and broccoli. Your baby needs it, and so do you.

Video Transcript

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From fertilized egg to garlic bulb-sized baby, your little one quickly goes through some amazing changes during her early weeks in your womb. She starts to take shape during week 5, transforming from an egg into an embryo. Her umbilical cord forms, which connects her to your blood supply. She's big enough to measure by week 6. But big is relative. She's just an eighth of an inch long. Her heart and lungs are growing too. Next week, she's the shape of a tiny tadpole and roughly the size of a pomegranate seed. Teeny limb buds are forming. Eventually, they'll become her arms and legs. Her eyes, mouth, and stomach are starting to take shape too. Your little one is about as big as a coffee bean by week 8. She can move around and swim now. Her tiny webbed fingers and toes are growing. Plus, her major organs have almost totally formed. Next week, she's the size of a peanut. Her little eyelids are growing in. And her tiny nose appears too. Her skeleton also starts taking shape, although the bones are soft. Your baby may be 1 inch big by week 10. That makes her about the size of a green olive. Her fingers and toes are becoming distinct, and her arms bend at the elbows. During week 11, your little one might double in size to 2 inches. She's the size of a strawberry, and her teeth, intestines, and genitals are forming. By the end of your first trimester, your baby is almost as big as a 2 and 1/2-inch bulb of garlic. Her profile, complete with tiny nose and chin, have grown in too. She's come a long way this first trimester, and she's got a lot of growing left to do.

10 Weeks Pregnant

Baby: Your baby is still small -- an inch long, about the size of a green olive -- but looks and acts like a baby. Arms and legs are longer and can bend at the elbows and knees. Fingers and toes become distinct.

Mom-to-be: Once the size of your fist, your uterus is now the size of a grapefruit. You still probably don't show much, but you may feel more comfortable in looser clothes. You may continue to feel tired and moody, but take heart: These symptoms shouldn't last too much longer.

Tip of the Week: Start shopping for maternity bras. You'll need one soon. You can go ahead and get nursing bras if you're planning to breastfeed.

11 Weeks Pregnant

Baby: It's another big growth week. Your baby is the size of a strawberry: 2 inches. When your doctor uses a Doppler stethoscope now, they can hear the rapid "swooshing" noises of the heartbeat. Little teeth buds appear in your baby's mouth. The intestines grow rapidly, pushing out into the umbilical cord. Your baby's genitals are developing, but the sex can't be determined yet by ultrasound.


Mom-to-be: Pregnancy hormones show their good and bad effects. You may notice that your hair, fingernails, and toenails are growing faster. But you may also notice oily skin and acne. Any nausea or vomiting should get better soon. You may still feel exhausted, even if you're able to get enough sleep.

Tip of the Week: Schedule a dentist appointment. See your dentist at least once in these 9 months. Brush and floss daily, and take your prenatal vitamin for calcium to keep your teeth strong. Your gums may bleed more because of pregnancy hormones and increased blood volume. If they do, use a soft toothbrush.

12 Weeks Pregnant

Baby: Your baby is 2.5 inches long, about the size of a garlic bulb. All parts of your baby are developing, from tooth buds to toenails. There’s now a recognizable profile, with a clear nose and chin. Your baby will keep developing and getting larger and stronger for the rest of your pregnancy. By the end of this week, the chance of miscarriage drops considerably.

Mom-to-be: You'll feel more energetic for the next few weeks. The typical weight gain by now is from 1.5 to 5 pounds. Extra melanin may make the skin on your eyelids, cheeks, and nose look brown. Increased blood flow may give your vulva a blue tint. Fathers-to-be might also have pregnancy symptoms, called couvade, or "hatching," during the third month and at delivery, including nausea, abdominal pain, appetite changes, and weight gain.

Tip of the Week: Try not to fret about stretch marks. Most women get them on the breasts, abdomen, hips, or buttocks sometime during pregnancy. They won't go away, but they usually fade after pregnancy. Despite claims from manufacturers, creams and oils don't minimize them. How much they show depends on your skin's natural elasticity.

What's Happening Inside You?

By the end of the third month, your baby is fully formed, with arms, hands, fingers, feet, and toes. Little hands can open and close. Fingernails and toenails are beginning to develop, and the external ears are formed. Teeth are starting to form. Your baby's reproductive organs also develop, but the baby's sex is difficult to distinguish on ultrasound. The circulatory and urinary systems are working, and the liver produces bile.

12 Weeks









WebMD Medical Reference Reviewed by Traci C. Johnson, MD on August 30, 2020


SOURCE: Mayo "Fetal development: What happens during the first trimester?"

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