Last updated on April 27th, 2021

Pregnancy Bump Size | Does It Matter? Well, With two best friends almost at the same point in pregnancy (one just a week ahead of the other), I couldn’t resist the urge to compare their baby bumps. They were a couple of weeks away from their due date. I realized that my petite friend, the one with the one-week lead, didn’t look big enough while the other, who stands tall at 5’10”, looked ready to pop.

Why the difference? Does the size of the bump matter, or is it only a question of physique and build? And, is the size of the bump an indication of the baby’s weight?

Pregnancy Bump Size
Compare their Bump Sizes

You can rest all your thoughts because I will reveal the mystery behind the shapes and sizes of baby bumps.

Factors determining the size of the bump

  • compare their baby bumpsFirst or Second Pregnancy-Women for whom it is their first pregnancy tend to have a smaller, neater bump. The stomach muscles are tight and more firm. In subsequent pregnancies, the stomach muscles that have already stretched once remain loose and tend to stretch more, resulting in a bigger bump.
  • Carrying Multiples-Women carrying twins or triplets will have a more significant bump than women with a single pregnancy.
  • Amount of Amniotic Fluid-The size of the bump is also affected by the amount of amniotic fluid present. A big bump means a lot of amniotic fluid.
  • Position of the baby-The position in which the baby lies is another determinant of the bump size. This factor also decides the difficulty a woman experiences in labor. A vertical position with either head or bottom down could result in a smaller bump in terms of width. But a horizontal position lying sideways will make the bump big and wide.
  • Mother’s body weight-Women who are underweight tend to have a smaller bump. Babies born to underweight women also tend to suffer from low birth weight. On the contrary, overweight women tend to show more than the gestational age, which is also not good.

Measuring the size of the baby bump

The midwife generally starts measuring the size of the bump between 25- 28 weeks of gestation. The midwife assesses fetal growth and development by measuring the fundal height. The fundal height is the measure of the distance from the pubic bone to the top of the uterus. The fundal height is measured in centimeters. After the first trimester, the fundal height corresponds with the weeks of gestation. Thus, if you are 28 weeks pregnant, the fundal height should be around 28 centimeters.

When does the bump size become a cause of worry?

The midwife will evaluate the size of the bump during antenatal checkups. If it is too small or too big, it will require further tests. A very small bump indicates a low growth rate of the baby or the presence of kidney diseases. A huge bump in addition to being overweight could pose serious health risks for both you and the baby. It increases the risk of gestational diabetes, high blood pressure, and Pre-eclampsia. All these factors will affect the size of the baby, labor, and delivery. 

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