Comparing your baby's size to familiar fruits can be a simple way to understand how fetal growth changes throughout pregnancy. From a tiny seed-sized embryo in early pregnancy to a baby approaching its birth size in the third trimester, fetal growth happens continuously.

Fruit comparisons are only approximate examples. They are not medical measurements and should not be used to determine whether your baby is growing normally.

For more accurate information about fetal development, see our fetal growth by week guide.

How Are Fruit Sizes Used During Pregnancy?

Pregnancy websites sometimes compare fetal size with fruits and vegetables to make weekly development easier to visualize.

For example, your baby may be described as approximately the size of:

• A blueberry

• A grape

• A lime

• An avocado

• A banana

• A mango

• A melon

These comparisons can make pregnancy milestones easier to understand, but different websites may use different fruits for the same pregnancy week.

This happens because fruits vary greatly in actual size.

Baby Size by Week Using Fruit Comparisons

The following examples provide a general visualization of how fetal size changes throughout pregnancy.

4 Weeks Pregnant

At around 4 weeks, the pregnancy is extremely small and early development is taking place.

A fruit comparison at this stage is only a rough visualization.

5 Weeks Pregnant

Around 5 weeks, the embryo is still very small.

Important early developmental processes are already underway, including the formation of structures that will eventually develop into the baby's organs and body systems.

6 Weeks Pregnant

By around 6 weeks, early development continues rapidly.

The embryo remains tiny, but major developmental changes are taking place.

7 Weeks Pregnant

At 7 weeks, the embryo is still very small.

The brain and nervous system continue developing, and early limb structures become more apparent.

8 Weeks Pregnant

At approximately 8 weeks, the embryo has undergone significant development.

The body is beginning to take a more recognizable shape.

9 Weeks Pregnant

Around 9 weeks, the pregnancy enters an important stage of fetal development.

The fetus continues developing its organs, limbs, and facial structures.

10 Weeks Pregnant

At 10 weeks, the fetus continues to grow while major organs and body structures develop and mature.

The head remains proportionally large compared with the rest of the body.

11 Weeks Pregnant

At 11 weeks, the fetus continues increasing in length.

The limbs, facial features, and internal structures continue developing.

12 Weeks Pregnant

By around 12 weeks, the fetus has become much more developed compared with the earliest weeks.

The body continues becoming more proportionate as pregnancy progresses.

13 Weeks Pregnant

At 13 weeks, the fetus continues growing and developing muscles, bones, organs, and other structures.

This is around the transition between the first and second trimesters.

14 Weeks Pregnant

At 14 weeks, the fetus continues to increase in length and develop stronger movements.

The face and body become increasingly recognizable.

15 Weeks Pregnant

At 15 weeks, the fetus continues developing bones, muscles, and the nervous system.

Some movements are occurring even though you may not yet be able to feel them.

16 Weeks Pregnant

Around 16 weeks, fetal growth becomes more noticeable.

The fetus continues developing muscles, bones, facial features, and body proportions.

17 Weeks Pregnant

At 17 weeks, the fetus continues increasing in size.

Bones and muscles continue developing, while movement becomes increasingly coordinated.

18 Weeks Pregnant

At 18 weeks, the fetus continues growing and developing the nervous system, bones, muscles, and internal organs.

Some people begin recognizing fetal movement around this stage, although timing varies.

19 Weeks Pregnant

Around 19 weeks, fetal growth continues and the body becomes increasingly proportionate.

The fetus remains active and continues developing sensory and nervous system functions.

20 Weeks Pregnant

Twenty weeks is approximately the halfway point of a 40-week pregnancy.

The fetus has recognizable body features and continues developing the brain, nervous system, muscles, bones, and organs.

A mid-pregnancy ultrasound may also be performed around this period.

Read our guide to the halfway point in pregnancy for more information.

21 Weeks Pregnant

At 21 weeks, the fetus continues increasing in length and weight.

The nervous system and other organs continue to mature.

22 Weeks Pregnant

At around 22 weeks, fetal development continues with increasing muscle activity and ongoing organ maturation.

The fetus continues gaining size as pregnancy progresses.

23 Weeks Pregnant

At 23 weeks, the fetus continues developing the brain, lungs, nervous system, and other organs.

Fetal movements may become increasingly noticeable.

24 Weeks Pregnant

Around 24 weeks, the fetus continues gaining weight and developing body fat, muscles, and organs.

Movement may be easier to recognize.

25 Weeks Pregnant

At 25 weeks, the fetus continues growing and gaining weight.

The brain and nervous system continue undergoing important developmental changes.

26 Weeks Pregnant

At 26 weeks, the fetus continues to increase in size while the lungs, brain, and nervous system mature.

27 Weeks Pregnant

At 27 weeks, the fetus is approaching the third trimester.

Continued weight gain and organ maturation become increasingly important.

28 Weeks Pregnant

At 28 weeks, the third trimester begins under the commonly used pregnancy dating system.

The fetus continues gaining weight while the brain and lungs undergo further maturation.

29 Weeks Pregnant

At 29 weeks, fetal growth continues steadily.

The fetus continues building body fat and developing the nervous system.

30 Weeks Pregnant

Around 30 weeks, the fetus continues increasing in weight and size.

The brain, lungs, and other organs continue maturing.

31 Weeks Pregnant

At 31 weeks, the fetus continues gaining weight and developing muscle and body fat.

Movements may feel stronger as the baby grows.

32 Weeks Pregnant

At 32 weeks, the fetus continues to grow rapidly.

The brain and nervous system continue maturing, while the lungs continue developing.

33 Weeks Pregnant

At 33 weeks, fetal growth continues with further weight gain and organ maturation.

The baby is becoming increasingly prepared for life outside the uterus.

34 Weeks Pregnant

At 34 weeks, the fetus continues gaining body fat and weight.

The brain, lungs, and nervous system continue developing.

35 Weeks Pregnant

At 35 weeks, the fetus continues to gain weight and mature.

The body is increasingly prepared for birth.

36 Weeks Pregnant

At 36 weeks, the fetus continues gaining weight while the lungs and other organs mature further.

37 Weeks Pregnant

At 37 weeks, the pregnancy is approaching the end of the typical gestational period.

The fetus continues developing and gaining weight.

38 Weeks Pregnant

At 38 weeks, the fetus continues preparing for birth.

Growth continues even though the baby is already close to its birth size.

39 Weeks Pregnant

At 39 weeks, the fetus is generally well developed and continues making final preparations for birth.

40 Weeks Pregnant

At around 40 weeks, the pregnancy reaches the commonly used estimated due date.

However, babies do not always arrive exactly on their estimated due date.

Fruit Size Comparisons Are Not Exact

One important thing to remember is that fruit comparisons are not standardized.

A mango, avocado, banana, or melon can have many different sizes.

Therefore, two pregnancy websites may use different fruit comparisons for the same week.

This does not necessarily mean that one source is wrong.

For medical assessment, healthcare professionals use measurements rather than fruit comparisons.

How Is Fetal Size Actually Measured?

Healthcare professionals may assess fetal size using ultrasound measurements.

Depending on gestational age and the purpose of the examination, measurements can include:

• Head circumference

• Abdominal circumference

• Femur length

• Other fetal measurements

• Estimated fetal weight

These measurements are interpreted according to gestational age and other pregnancy information.

If growth needs to be monitored more closely, your doctor may recommend additional ultrasound examinations.

Does Fruit Size Tell You How Big Your Baby Is?

No.

Fruit comparisons are designed to make fetal development easier to visualize.

They do not provide an accurate estimate of your baby's actual length or weight.

If you are concerned about your baby's growth, discuss your concerns with your obstetrician or healthcare provider.

Why Does Baby Size Change So Much During Pregnancy?

The fetus undergoes several types of development throughout pregnancy.

These include:

• Increase in length

• Increase in weight

• Bone development

• Muscle development

• Brain development

• Organ maturation

• Nervous system development

• Accumulation of body fat

Growth is not perfectly uniform from one week to the next.

Different organs and body systems develop at different rates.

Does the Baby Have a Growth Spurt?

Fetal growth changes throughout pregnancy, and some periods may involve particularly rapid increases in size or development.

However, fetal growth is not exactly the same as the growth spurts seen in babies and children after birth.

For a detailed explanation, read our guide to fetal growth by week.

How Does Your Pregnancy Belly Change With Baby Size?

Your abdomen generally becomes larger as the uterus expands during pregnancy.

However, belly size does not directly indicate fetal size.

Two people at the same pregnancy week may have very different-looking bumps.

Differences can result from:

• Body shape

• Height

• Abdominal muscles

• Previous pregnancies

• Fetal position

• Uterine position

• Amount of amniotic fluid

• Number of babies

For this reason, comparing your bump with fruit-size charts or another pregnant person's belly is not a reliable way to assess fetal growth.

How Can You Track Your Pregnancy Week?

Knowing your pregnancy week makes it easier to understand the baby's expected developmental stage.

Our pregnancy calculator can help estimate your:

• Pregnancy week

• Estimated due date

• Conception date

• Trimester

• Time remaining until your due date

Once you know your pregnancy week, you can explore the corresponding stage in our fetal growth by week guide.

Frequently Asked Questions

What are fruit sizes for pregnancy?

Fruit sizes for pregnancy are comparisons used to help visualize approximate fetal size at different stages of pregnancy.

What fruit is a baby at 20 weeks?

Different pregnancy resources use different fruit comparisons for 20 weeks. Fruit comparisons are approximate and should not be considered medical measurements.

How big is a baby at 16 weeks?

At 16 weeks, the fetus is considerably larger than during the first trimester and continues growing rapidly. Exact measurements vary, and ultrasound provides a more useful assessment of fetal size.

How big is a baby at 24 weeks?

At 24 weeks, the fetus continues increasing in length and weight while the brain, lungs, nervous system, and other organs continue developing.

What fruit is a baby at 30 weeks?

Fruit comparisons vary between sources. At 30 weeks, the fetus is continuing substantial growth and weight gain, but fruit comparisons should only be used as a general visualization.

Are pregnancy fruit comparisons accurate?

They are useful for visualization but are not precise. Fruits vary in size, so they should not be used to estimate fetal weight or diagnose growth problems.

How is fetal growth measured?

Fetal growth can be assessed using ultrasound measurements such as head circumference, abdominal circumference, femur length, and estimated fetal weight.

Does a bigger pregnancy belly mean a bigger baby?

Not necessarily. Belly size is affected by many factors and cannot accurately determine fetal size.

Final Takeaway

Fruit sizes for pregnancy can make it easier to visualize how your baby grows from week to week. However, these comparisons are approximate and vary between pregnancy resources.

For a more meaningful understanding of fetal development, consider your baby's gestational age, clinical assessments, and ultrasound measurements when recommended.

Explore our complete fetal growth by week guide for detailed weekly development.

You can also use our pregnancy calculator to estimate your pregnancy week and due date.