Intro
THE FIRST TRIMESTER
4 weeks
10 weeks
12 weeks
THE SECOND TRIMESTER
18 weeks
22 weeks
27 weeks
THE THIRD TRIMESTER
30 weeks
35 weeks
40 weeks
Intro
THE FIRST TRIMESTER
4 weeks
8 weeks
12 weeks
THE SECOND TRIMESTER
16 weeks
20 weeks
24 weeks
THE THIRD TRIMESTER
27 weeks
30 weeks
34 weeks

Your Baby’s Growth, Week by Week

There is no doubt that pregnancy is an amazing process. Follow along as your baby grows and develops over the next 9 months, and be sure to share his or her progress with family and friends.

Are you having one baby or twins?

THE FIRST TRIMESTER

The first trimester is the beginning of your baby’s journey, spanning about 12 weeks. This stage is vital, as it starts from conception and slowly creates the fetus that will be your beautiful newborn.

POPPY SEED

poppy seed

At four weeks of pregnancy, your baby is about the size of a poppy seed. This is the development and conception stage that you or your surrogate is currently going through.

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Hundreds of cells are multiplying and developing.

With a success of conception, a primitive version of the placenta will slowly form.

GREEN OLIVE

According to the National Institute of Health, the embryonic stage ends at 10 weeks and your baby officially becomes a fetus. At this week, some of the major organs begin to grow.

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What was once just buds have now grown into arms, legs, fingers and toes.

Organs such as lungs and a heart begin to develop.

LIME

As the first trimester comes to an end, the fetus will be around the size of a lime. At this point in time, your baby has undergone a series of physical changes and is more recognizable.

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Limbs are longer and more defined.

The face is formed. Your baby’s eyes will remain closed until about the 28th week.

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Nails begin to appear and buds for your baby’s teeth appear.

At this point in time, your baby can make a fist.

THE SECOND TRIMESTER

Spanning from 13 to 27 weeks, the second trimester marks the halfway point for your baby. Big moments are soon to come including the identification of your baby’s sex, the ability for him or her to move and further development of certain organs, muscles and bones.

BELL PEPPER

Your baby has started to develop bones and muscles and will also be able to move and stretch. The skin of your baby is almost transparent as it still grows in the womb.

The sex of your baby can be or will soon be determined.

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Your baby will slowly grow more active and flutter within the womb.

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Your baby’s ability to hear slowly develops.

SPAGHETTI SQUASH

This is now the halfway point of pregnancy. Your baby has gained weight and will be around 14 to 15 ounces and 10 to 12 inches long. Features such as nails, eyebrows and eyelashes slowly appear.

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Very thin hair known as lanugo hair begins to grow on your baby.

Your baby’s heartbeat can be heard via stethoscope.

CAULIFLOWER

By week 27, your baby can practice breathing and has an increase in brain activity. The average size of the babies at this phase is 14 to 15 inches long and roughly more than a pound.

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A nervous system has developed enough to control some body functions.

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Eyelids will soon be able to open and close.

THE THIRD TRIMESTER

The home stretch of pregnancy has arrived. The third trimester is the most important phase for you, your surrogate and your baby. Your baby’s organs continue to develop, and he or she starts reacting to light and sounds.

CABBAGE

The brain of your baby is developing more and more. General weight of your baby is roughly 2 to 3 pounds and 15 to 16 inches long. The skin of your baby begins to smooth out as they grow in the womb.

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Your baby may respond to loud noises.

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The irises in your baby’s eyes can react to light.

HONEYDEW

At around 5 ½ pounds, your baby has reached the last stages in your pregnancy. Bones may be soft but are now fully developed. Your baby will also gain weight as more muscle and fat forms.

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Hair on the head has become coarser and thicker.

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Your baby is more receptive to sounds including music.

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Your baby will also slowly begin to rotate to get into the right position for birth.

WATERMELON

The end of pregnancy is near. Your child will be roughly 6 to 9 pounds and is due any day now. Your baby is considered full term, and his or her brain has fully developed.

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Lungs are fully matured and can function without the aid of the womb.

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There is a possibility that your child may arrive earlier than the 40th week.

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Other organs have fully formed, including the liver.

THE FIRST TRIMESTER

The first trimester is the beginning of the journey for your babies, spanning about 12 weeks. This stage is vital, as it starts from conception and slowly creates the fetuses that will be your beautiful newborns.

BEANS

beans

At four weeks of pregnancy, your babies are about the size of two beans. This is the development and conception stage that you or your surrogate are currently going through.

Upper and lower limb buds will begin to sprout.

With a success of conception, a primitive version of the placenta will slowly form.

RASPBERRIES

An ultrasound may identify whether your soon-to-be baby is two babies. The developed hearts of your babies have formed along with arms and legs that can bend.

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Soon your twins will officially be fetuses.

Organs will slowly start to develop.

LIMES

Each of your twins should be about 2 inches in length and roughly the size of a lime. As the first trimester comes to an end, your babies’ faces are starting to look more human, and other organs have begun to develop further.

Your twins are training their diaphragms through tiny hiccups.

It isn’t uncommon for one of your twins to be bigger than the other during this week.

Babies now can make a fist.

THE SECOND TRIMESTER

Spanning from 13 to 27 weeks, the second trimester marks the halfway point for your twins. Big moments are soon to come, including the identification of genders, the ability for each to move and further development of certain organs, muscles and bones.

AVOCADOS

It’s estimated that your twins will be about 4 inches in length and are roughly the size of an avocado. Their arms and legs will continue to grow longer, and their skeletons, currently made of cartilage, begin to harden.

Sonographers can identify the genders of your twins.

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Babies can now kick, but the surrogate may not feel it.

You may be able to hear the heart beats of each baby.

BANANAS

Both babies should be around 5 inches to 6 inches in length. A thin membrane lies between the two, but they are close enough to lean and touch each other.

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Hair is growing on the head of both your babies.

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The ability to hear and react to light develops further.

CANTALOUPES

Your twins are looking more and more like newborns, except they have wrinkled skin and are much thinner. The skin is also becoming less see-through and boasting a fresh pink glow. Each of your babies are about the size of a cantaloupe and may weigh 1 pound.

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Although not ready to breathe air, your twins’ lungs are maturing more and more.

Each twin is estimated to measure at 10 to 11 inches in length.

Distinct lips and eyes form on their faces.

THE THIRD TRIMESTER

The home stretch of pregnancy has arrived. The third trimester is the most important phase for your babies. Organs will continue to develop, and they start reacting to light and sound.

LETTUCE

As the babies continue to develop, they slowly grow to about the size of a head of lettuce. Their skeletons are also changing into bone, and layers of fat begin to form.

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Your twins will start sleeping and waking in regular intervals.

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Each baby’s brain develops more and should officially show activity.

Each should have an estimated weight of 2 pounds.

ZUCCHINIS

Twin should be able to open and close their eyes as their brains begin to further develop. At this point, your babies may have grown to 15 inches in length.

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More layers of fat form around each baby.

Toenails and fingernails form for each baby.

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The arrival of your twins should occur in the weeks following.

BUTTERNUT SQUASHES

Your babies are estimated to be 20 inches in length and have fully developed organs. The final layer of fat has formed around your babies, and organs enter their final stages of development before birth.

On average, twins are born at the end of the 36th week.

Your twins are fully receptive to sound, so feel free to play music and talk to them.