Pregnancy Week by Week in Photos

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Reproductive Anatomy of a Woman

Uterus, ovary, fallopian tube.
Uterus, ovary, fallopian tube. Photo © A.D.A.M.

Your baby grows amazingly in pregnancy. From the very first few weeks of pregnancy until the day your baby is born, your baby is developing and preparing to be born. Here is a way to follow that growth during pregnancy with a week by week pregnancy calendar filled with fetal development images. (Click on each image to be taken to a snapshot of that week's fetal development and a larger image.)

Pregnancy - Week One

Your menstrual cycle is starting as you are on your period. To get pregnant you will want to consider tracking your ovulation to increase your chances of conception​.

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Reproductive Anatomy of a Man

Male Reproductive Anatomy
Male Reproductive Anatomy. Photo © A.D.A.M.

Pregnancy - Week Two

The health of the man is important to fetal health as well. While men are capable of getting someone pregnant as long as they are alive, it is now coming to light that they need to work on being healthy too.

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Pregnancy Week by Week in Photos - Week 3

Blastocyst - 3rd Week of Pregnancy
Blastocyst - 3rd Week of Pregnancy. Photo © A.D.A.M.

Pregnancy - Week Three

Relax, you're in the two week wait. This means that you are waiting until you can take a pregnancy test. This can be tiresome and nerve wrecking, but remember it's worth it. For now, act pregnant so that you can give your baby the best start!

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Pregnancy Week by Week in Photos - Week 4

Embryo - 4th Week of Pregnancy - First Trimester
This is an embryo in the 4th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Four

Are you ticking off the signs of pregnancy while you ask yourself if you're pregnant? The basics have begun forming but are not really recognizable as the image you probably have of a baby yet. Towards the end of this week and into next week, an early ultrasound can show a gestational sac.

Social Baby Updates:

Share your baby's progress with friends and family on Facebook and Twitter. Just copy and paste the following into you status update on Facebook or your Twitter stream:

The pregnancy test is now positive! At 4 weeks, our baby is very small but growing. Come see what's going on... http://ow.ly/53CxL

More from Week Four:
Ultrasounds | Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 5

Embryo - 5th Week of Pregnancy - First Trimester
This is a baby in the 5th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Five

The neural tube is what you hear a lot about when you're talking about folic acid and preventing neural tube defects. This is why folic acid and prenatal vitamins prior to pregnancy and in early pregnancy are so important.

More from Week Five:
Ultrasounds | Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 6

Embryo - 6th Week of Pregnancy - First Trimester
This is a baby in the 6th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Six

This week you can see the beginning of the limb buds as well as the beginning of the forebrain. It's amazing how quickly your baby is changing and developing in pregnancy.

More from Week Six:
Ultrasounds | Pregnancy Calendar | 6 Week Pregnant Belly Photos

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Pregnancy Week by Week in Photos - Week 7

Embryo - 7th Week of Pregnancy - First Trimester
This is a baby in the 7th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Seven

Social Baby Updates:

Share your baby's progress with friends and family on Facebook and Twitter. Just copy and paste the following into you status update on Facebook or your Twitter stream:

Look! I've got hands, mom has acne... Loving week seven of pregnancy. http://ow.ly/53FxG

This week in pregnancy, you can see finger rays in your baby.

More from Week Seven:
Ultrasounds | Pregnancy Calendar | Belly Photos | How big is my baby?

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Embryo in the 8th Week of Pregnancy

Embryo - 8th Week of Pregnancy - First Trimester
This is a baby in the 8th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Eight

It's hard to imagine that you are even pregnant. You haven't gained much weight usually, and other than lots of negative pregnancy symptoms, you're probably feeling like you've been invaded by an alien rather than be happily pregnant. On the other hand, your baby is rapidly growing and making amazing changes, even at this early stage of pregnancy. Your baby still has a bit of a tail, but to make you feel better, stare at the toe rays instead.

More from Week Eight:
Ultrasounds | Pregnancy Calendar | Belly Photos

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Pregnancy Week by Week in Photos - Week 9

Embryo - 9th Week of Pregnancy - First Trimester
This is a baby in the 9th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Nine

Your baby can move spontaneously. Maybe to wiggle the tiny toe rays? If you have an early ultrasound, you can see these tiny movements.

More from Week Nine:
Ultrasounds | Pregnancy Calendar 

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Pregnancy Week by Week in Photos - Week 10

Embryo - 10th Week of Pregnancy - First Trimester
This is a baby in the 10th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Ten

Your baby weighs the same as four paper clips and the tail is gone! Your baby's eyes are also open now, but don't yet resemble the lovely newborn eyes you'll greet at birth approximately 30 weeks from now.

More from Week Ten:
Ultrasounds | Pregnancy Calendar | 10 Week Belly Photos

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Pregnancy Week by Week in Photos - Week 11

Fetus - 11th Week of Pregnancy - First Trimester
This is a baby from the 11th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Eleven

Your baby weighs about as much as seven paper clips or seven grams this week. The head is bigger than the body and will continue to be that way for awhile. Even at birth, proportionally, the head is a large percentage of the body compared to an adult. As you near the end of the first trimester you may be feeling a lot better. Some moms, particularly if they are having their second baby, may already be showing a bit.

More from Week Eleven:
Ultrasounds | 11 Week Belly Photos | Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 12

Fetus - 12th Week of Pregnancy - First Trimester
This baby is from the 12th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Twelve

Your baby had a real growth spurt this week and now weighs 14 grams or 14 paper clips. But the good news is that you should be able to hear the heart beat at your midwife or doctor's appointment! This is exciting to hear the hoof beat sound of a baby.

More from Week Twelve:
Ultrasounds |  Pregnancy Calendar | How big is my baby?

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Pregnancy Week by Week in Photos - Week 13

Fetus - 13th Week of Pregnancy - Second Trimester
This is a baby in the 13th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Thirteen

Twenty eight paper clips! (Are you starting a small pile on your desk?) Your baby is a whole ounce now, or 28.3 paper clips heavy. In addition to gaining weight, your baby has also undergone lots of other changes, like the production of meconium in the intestines, the formation of teeth and more. Did you know that your placenta weighs about an ounce as well at this point?

More from Week Thirteen:
Ultrasounds | 13 Week Belly Photos | Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 14

Fetus - 14th Week of Pregnancy - Second Trimester
This is a baby from the 14th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Fourteen

Your baby is just shy of five inches long! That's about half the length of a pencil.

More from Week Fourteen:
Ultrasounds | 14 Week Belly Photos | Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 15

Fetus - 15th Week of Pregnancy - Second Trimester
This is a baby from the 15th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Fifteen

Your baby weighs in at a whopping 70 grams or paper clips, so just under three ounces. The cowlick that you will forever be combing down is now in place as well.

More from Week Fifteen:
Ultrasounds | 15 Week Belly Photos | Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 16

Fetus - 16th Week of Pregnancy - Second Trimester
This baby is from the 16th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Sixteen

This week your baby is 16 centimeters long or 6.3 inches. 85 paper clips weigh as much as your baby weighs, that equivalent to 85 grams. Did you know that your baby urinates into the amniotic fluid?

More from Week Sixteen:
Ultrasounds | 16 Week Belly Photos | Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 17

Fetus - 17th Week of Pregnancy - Second Trimester
This baby is from the 17th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Seventeen

Though you may not feel it, your baby may be startled by loud noises. Your baby weighs more than the placenta now. 142 grams is roughly the same as 142 paper clips.

More from Week Seventeen:
Ultrasounds | 17 Week Belly Photos | Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 18

Fetus - 18th Week of Pregnancy - Second Trimester
This baby is from the 18th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Eighteen

198 paper clips equals about seven ounces, so your baby is growing a lot. The bones are undergoing a process called ossification, which means they are hardening.

More from Week Eighteen:
Ultrasounds | 18 Week Belly Photos | Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 19

Fetus - 19th Week of Pregnancy - Second Trimester
This baby is from the 19th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Nineteen

Your baby is covered in a fine hair called lanugo. Sometimes you can still see it on your baby after birth, particularly on the shoulders and even the baby's ears. Your baby weighs about eight ounces or 227 paper clips.

More from Week Nineteen:
Ultrasounds | 19 Week Belly Photos | Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 20

Fetus - 20th Week of Pregnancy - Second Trimester
This baby is from the 20th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Twenty

This week you will have 283 paper clips in your collection as your baby weighs about 10 ounces. Your baby is also 10 inches long, which is about the size of a human foot. (A quick reminder that baby weights are approximates and that baby weights can vary widely. Talk to your doctor or midwife for more specifics.)

More from Week Twenty:
Ultrasounds | 20 Week Belly Photos | Pregnancy Calendar | How big is my baby?

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Pregnancy Week by Week in Photos - Week 21

Fetus - 21st Week of Pregnancy - Second Trimester
This baby is from the 21st week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Twenty-One

Your baby has almost reached the one pound mark! That about 369 paper clips! Your baby still has a lot of room to move around. If you have had a baby before you can usually feel this quite well. If this is your first baby you may not feel your baby yet but will very soon. These first feelings of fetal movement are known as Quickening.

More from Week Twenty-One
Ultrasounds | 21 Week Belly Photos | Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 22

Fetus - 22nd Week of Pregnancy - Second Trimester
This baby is in the 22nd week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Twenty-Two

Your baby is nearly 11 inches long! And at 15 ounces, your paper clip collection has grown to be about 425 paper clips. Have you felt the baby move yet?

More from Week Twenty-Two
Ultrasounds | 22 Week Belly Photos | Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 23

Fetus - 23rd Week of Pregnancy - Second Trimester
This baby is in the 23rd week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Twenty-Three

510 paper clips! That's about one pound and two ounces. But even more importantly are the finger nails that are growing on your baby. They are now present and by the time your baby is born, you'd better have the nail clippers ready!

More from Week Twenty-Three
Ultrasounds | 23 Week Belly Photos | Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 24

Fetus - 24th Week of Pregnancy - Second Trimester
This baby is in the 24th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Twenty-Four

Your baby is getting fat! Brown fat that is... This is what will help keep your baby warm as a newborn. The skinny frame will now begin to fill out. Your baby now weighs about one pound and five ounces or 595 paper clips. Your baby is now almost as long as a rule, at 11.8 inches.

More from Week Twenty-Four
Ultrasounds | 24 Weeks Belly Photos | Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 25

Fetus - 25th Week of Pregnancy - Second Trimester
This baby is in the 25th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Twenty-Five

While weights can vary, your baby is probably just over a pound and a half, or about 709 paper clips.

More from Week Twenty-Five
Ultrasounds | 25 Weeks Belly Photos | Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 26

Fetus - 26th Week of Pregnancy - Second Trimester
This baby is in the 26th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Twenty-Six

Your baby is able to hear a lot now, particularly in terms of your body. Did you enjoy a bubbly drink? Your baby can tell. Even plain old digestion is heard. This is why quiet rooms can sometimes be distressing for newborns. Your baby can also see light or dark through the abdomen and uterus. Some babies will turn towards the sun if you are outside. Your baby is about 1 pound and 12 ounces or 794 paper clips. The baby is also about 12.8 inches long, so just a bit longer than a ruler.

More from Week Twenty-Six
Ultrasounds | 26 Weeks Belly Photos | Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 27

Fetus - 27th Week of Pregnancy - Second Trimester
This baby is in the 27th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Twenty-Seven

Did you know that your baby's umbilical cord is covered in a substance called Wharton's Jelly. This is what protects the umbilical cord from the twists and turns of your baby's movements. Your baby has hit the two pound mark - that's 900 paper clips.

More from Week Twenty-Seven
Ultrasounds | Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 28

Fetus - 28th Week of Pregnancy - Third Trimester
This baby is in the 28th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Twenty-Eight

While we hope you don't experience preterm labor or premature birth, your baby does have a good chance of survival if born now with good medical care. Your baby also has eye lashes now. Your baby weighs about 2 pounds 4 ounces or 1,000 paper clips!

More from Week Twenty-Eight
Ultrasounds | Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 29

Fetus - 29th Week of Pregnancy - Third Trimester
This baby is in the 29th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Twenty-Nine

Your baby urinates about 1/2 a liter a day! Diapers here we come! Since your baby's space is getting a bit more cramped, despite the fact that your belly is enlarging, you may notice that your baby feels less acrobatic in there and more wiggly. This is normal. Your baby can weigh about two pounds nine ounces or 1160 paper clips!

More from Week Twenty-Nine
Ultrasounds | Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 30

Fetus - 30th Week of Pregnancy - Third Trimester
This baby is in the 30th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Thirty

Your baby is nearly fifteen inches long. Baby also weighs in at about 1360 paper clips or three pounds!

More from Week Thirty
Ultrasounds | Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 31

Fetus - 31st Week of Pregnancy - Third Trimester
This baby is in the 31st week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Thirty-One

Your baby's eyes can dilate in response to light. How cool is that? In addition to brown fat, your baby is getting some white fat deposits as well. This makes your baby look more pink than red. Your baby can weigh about 3 pounds 5 ounces or 1500 paper clips.

More from Week Thirty-One
Ultrasounds | Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 32

Fetus - 32nd Week of Pregnancy - Third Trimester
This baby is in the 32nd week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Thirty-Two

Weighing in about 1700 paper clips or three pounds eleven ounces, your baby has gained weight! Your baby is almost 16 inches long at 40 centimeters. The fat deposits are helping baby's face to fill out.

More from Week Thirty-Two
Ultrasounds | Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 33

Fetus - 33rd Week of Pregnancy - Third Trimester
This baby is in the 33rd week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Thirty-Three

There are nearly two pints of amniotic fluid in your uterus right now. Your baby also weighs about four pounds or 1800 paper clips. While your baby is not growing an any organs or structures, your baby still has a lot of work to do to be ready for birth, particularly in terms of lung maturity and brain development.

More from Week Thirty-Three
Ultrasounds | Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 34

Fetus - 34th Week of Pregnancy - Third Trimester
This baby is in the 34th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Thirty-Four

Four pounds seven ounces is 2,000 paper clips! Your baby is also probably just shy of 17 inches in length. Are you doing your fetal kick counts?

More from Week Thirty-Four
Ultrasounds | Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 35

Fetus - 35th Week of Pregnancy - Third Trimester
This baby is in the 35th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Thirty-Five

Your baby weighs about 4 pounds 12 ounces (2,150 paper clips), although later in pregnancy there is more room for variation than in the beginning of pregnancy. Your baby is putting on an average of a half a pound per week at this point. The length is reaching 18 inches from head to toe, as opposed to the earlier measurements from crown to rump.

More from Week Thirty-Five
Ultrasounds | Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 36

Fetus - 36th Week of Pregnancy - Third Trimester
This baby is in the 36th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Thirty-Six

Baby weighs about five pounds two ounces (2,300 paper clips) and measures 45 cms or 17.8 inches. Although here at the end there is a larger margin of difference among babies. Ask your practitioner to palpate (feel through your abdomen) to guesstimate the weight. Remember it is just a guess, although some are better than others.

More from Week Thirty-Six
Ultrasounds | Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 37

Fetus - 37th Week of Pregnancy - Third Trimester
This baby is in the 37th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Thirty-Seven

Your baby is practicing breathing by inhaling amniotic fluid. Sometimes the baby will even get hiccups! Your baby weighs about five pounds two ounces or about 2,610 paper clips.

More from Week Thirty-Seven
Ultrasounds | Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 38

Fetus - 38th Week of Pregnancy - Third Trimester
This baby is in the 38th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Thirty-Eight

Your baby may be adding as many as 28 paper clips to their weight total at this point in pregnancy. Your baby is about 2,790 paper clips in weight.

More from Week Thirty-One
Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 39

Fetus - 39th Week of Pregnancy - Third Trimester
This baby is in the 39th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Thirty-Nine

While weights may vary, your baby could weigh about 3,130 paper clips or 6.9 pounds. Your baby is probably between 18-20 inches long at this point.

More from Week Thirty-Nine
Birth Videos | Pregnancy Calendar

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Pregnancy Week by Week in Photos - Week 40

Fetus - 40th Week of Pregnancy - Third Trimester
This baby is in the 40th week of pregnancy. Photo © A.D.A.M.

Pregnancy - Week Forty

If your baby's weight is an average seven and a half pounds, your baby now weighs in at about 3,400 paper clips.

More from Week Forty
Birth Videos | Pregnancy Calendar

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Childbirth, Labor and Contractions

Uterus and Baby During and Between Contractions
Contractions During Childbirth. Photo © A.D.A.M.

Related:

More from Week Forty-One
Birth Videos | Pregnancy Calendar

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After Birth - Cutting the Cord

Cutting the Umbilical Cord
Photo © A.D.A.M.

The umbilical cord will be cut after the birth of a baby. Some practitioners will cut the cord right away, while others will wait until the cord stops pulsating. Sometimes you or your partner can also cut the cord. There are no nerves in the umbilical cord and it does not hurt the mother or newborn baby.

Related:

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2nd Trimester Ultrasound Photos and Pictures

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