Pregnant Belly Size Chart And Shape

Pregnant Belly Size Chart And Shape

Image: Shutterstock

IN THIS ARTICLE

Things that we may not like under normal circumstances become the most lovable during pregnancy. One such experience is the growing belly. In fact, we are so excited about it that we don’t mind looking in the mirror and feeling proud of the paunch almost every day.

The pregnancy belly becomes so important that some women might begin worrying if the belly is smaller than that of the others. But should you worry about it? And how do you know if your belly is growing right?

In this MomJunction post, we tell you about the factors that determine your belly size, share the pregnancy belly growth chart, and address the related concerns.

Does The Belly Size In Pregnancy Really Matter?

No, the size of your pregnancy belly does not matter. Your belly could be big, small or high, but that still won’t affect the pregnancy. So there is no need to worry. People may try to guess the baby’s gender, health and progress by looking at your belly, but you should not worry about what anyone other than your doctor says.

Does Your Belly Size Determine The Gender And Size Of The Baby?

The belly size and shape determine neither the size nor the gender of the baby. A large belly could be due to excess body weight or amniotic fluid, while a small belly could be due to low amniotic fluid or if it is the first pregnancy. But the size of the belly has nothing to do with the gender of the baby.

Can Belly Size Accurately Indicate Your Stage of Pregnancy?

No, the size of the belly cannot be an indication of the stage of pregnancy. The belly size during different phases of pregnancy differs from one woman to another, based on her body type and size. Regardless of the belly size, ensure that you’re maintaining a healthy weight as being overweight or underweight during pregnancy might affect the growth of the baby (1).

It is best not to compare the size of your bump with that of other pregnant women, as the belly size depends on several factors.

What Factors Determine Your Belly Size?

The following factors determine the size and shape of the pregnant belly:

  1. First pregnancy: If it is your first pregnancy, you will have a compact bump as the abdominal muscles have not been stretched before. The muscles that hold your baby high feel tight and toned. Also, the bump is likely to be small, but that does not mean your baby would be smaller.
  1. Second or subsequent pregnancy: The first pregnancy could stretch your abdominal muscles and make it quite flexible. Unless you are into fitness or you are an athlete, your muscles won’t regain their original shape or tone back. So, you may notice a bigger bump than before. Again, that does not mean your baby would be bigger.
  1. Amniotic fluid volume: Throughout the pregnancy, the amniotic fluid index keeps changing. The average index of the amniotic fluid in a normal pregnancy is more during the second trimester, while it is comparatively less during the third trimester. Based on the production of this fluid, but not your baby’s size, your belly may appear small or big (2).
  1. Change in the baby’s positions: From the second trimester, the baby becomes active and begins to move inside the tummy. This may alter the shape and size of your belly. For instance, your baby can sometimes move from one side to the other, changing the shape of the tummy slightly (3).

And during the last stage of pregnancy, the head generally goes downwards, making the tummy look bigger at the bottom. Thus, the baby’s position is a factor that can affect the belly size and shape.

  1. Mother’s height: Taller women have a longer torso, which gives enough space for the baby to grow. So, while the baby grows, the belly grows upwards and not outwards. On the other hand, shorter women will have less space and their baby will push outwards and not upwards.

Next, we give you a chart of the average belly size during pregnancy.

Pregnancy Belly Size Chart

This chart shows the changes you may notice in your belly as the baby grows. It is an approximate chart, and the measurements and changes could vary from one woman to another (4).

Month/weekBelly size/fetal development
First month (week 1-4)
  • No change in belly size
  • The fetus is just about the size of ¼ inch
Second month (week 5-8)
  • A firm belly, not a lot of difference in the belly size
  • The fetus’ size is about one inch
Third month (week 9-13)
  • A tiny bump starts to appear at the bottom
  • The fetus is about four inches
Fourth month (week 14-17)
  • The belly grows and is noticeable
  • The fetus is about six inches
Fifth month (week 18-21)
  • The belly is pronounced; it is visible, and the shape may vary. Some are high, some low, and some bulge at the middle
  • The baby may grow to about ten inches
Sixth month (week 22-26)
  • The belly grows double the size and looks similar to a basketball
  • The baby grows to about 12 inches
Seventh month (week 27-30)
  • The baby’s growth gets slower, and the belly size may be constant or increase
  • The baby is now about 14 inches
Eighth month (week 31-35)
  • The belly size is the same, but it looks bigger
  • The baby would grow up to 18 inches
Ninth month (week 36-40)
  • The belly looks curvy and bigger
  • The baby would be about 18-20 inches

In case you do not notice the above changes, do not panic or assume something is wrong. Check with the doctor if you’re worried about the shape or size of the belly.

Common Concerns About The Pregnant Belly

Some of the common concerns that pregnant women have about their bellies are mentioned here:

  1. Small belly: If you have a small belly and your doctor tells you it is normal, then you do not have to worry about it. One of the reasons for carrying a small belly could be oligohydramnios or low amniotic fluid. The condition can be diagnosed through an ultrasound, and the doctor could suggest a treatment based on factors such as its extent and your medical history (5).
  1. Large belly: If your belly is growing quickly, you may visit your doctor for a check-up. Usually, it could be normal due to your previous pregnancy or other factors. It could also be due to polyhydramnios, or a high amount of amniotic fluid (6), which your doctor would diagnose and guide you.
  1. High belly: If you are carrying high, it usually means you have a good muscle tone and strong abdominal muscles. Also, it could be because you’re tall. A high pregnancy belly is considered normal. However, make sure your doctor monitors the size of the belly regularly.
  1. Low belly: With a low belly, it might seem like the baby is ready to come out any minute. But that is not always the case. Carrying a low belly could cause discomfort, pressure on the lower back, and pain in the lower back region in some women.
  1. Wide belly: Carrying wide usually means that the baby is in a side-to-side position, a situation termed as a transverse lie (7). It could be a problem if the baby does not turn downwards (head downwards) at the time of labor. However, even overweight pregnant women could carry wide, which is not a concern.

Your pregnancy belly lasts only as long as your pregnancy, so celebrate it with special activities.

Celebrating Your Pregnancy Belly

Here are some exciting ideas to make your pregnancy memorable:

  1. Photoshoot: A pregnancy photo shoot is a trend these days, and lets you capture your pregnancy belly every month and create a beautiful collage at the end.
Photoshoot

Image: Shutterstock

  1. Belly painting: Painting something creative and beautiful on your belly is another thoughtful way to celebrate your pregnancy. You can let your husband or kid do it, or get it done professionally.
Belly painting

Image: Shutterstock

  1. Pregnancy book: You can record anything and everything about your pregnancy. Take pictures of your pregnancy belly every week and paste them in the book. Also, you can write what you are feeling at every stage. Your baby would be happy to read it when he/she grows up.
Pregnancy book

Image: Shutterstock

Enjoy every week of your pregnancy, eat healthy foods and follow the instructions of your doctor. Do not pay attention to the folklore surrounding the shape and size of a pregnant woman’s belly. Also, ensure that your doctor is carefully monitoring fetal growth and belly size.

How was your pregnancy belly? Do share your experiences and what stories you came across about your belly in the comment section below.

References:

1. R. Horsager-Boehrer; Worried about having a big baby? Four things to know about birth weight; UT Southwestern Medical Center (2017)
2. A. Kofinas and G. Kofinas; Differences in amniotic fluid patterns and fetal biometric parameters in third trimester pregnancies with and without diabetes; The Journal of Maternal-Fetal and Neonatal Medicine (2006)
3. Pregnancy: The Second Trimester; Johns Hopkins Medicine
4. Fetal development: Stages of growth; Cleveland Clinic
5. Amniotic Fluid Problems/Hydramnios/Oligohydramnios; Children’s Hospital of Philadelphia
6. Polyhydramnios; Lee Health
7. R. E. Jackson; Transverse presentation of the fetus; University of Nebraska Medical Center

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