They explained that a taller woman may not show a bump as early as a shorter mom. Additionally, a shorter woman may grow wider because “the baby has less room to move up and down.”
Pregnancy Progress
Another factor that affects baby bump size is the way the pregnancy progresses for each woman. For example, a mother who’s constantly experiencing nausea and vomiting may experience weight loss. This weight loss could lead to a smaller-looking bump.
On the other hand, if the mom experiences weight gain early in the pregnancy, she may grow faster and have a wider-looking bump.
Finally, a surge of progesterone hormones can lead to bloating which may change the shape of the bump.

The Amount of Amniotic Fluid
Interestingly, even though it can change every hour or so, the amount of amniotic fluid also contributes to the size and shape of the baby bump.
Reports say that in the earlier stages of pregnancy, it’s mostly the mom’s body that creates amniotic fluid. However, in the later stages, the baby will also make the fluid through urine outputs. If you or your baby is making a lot of fluids, then it can alter how your bump looks.
The Baby’s Position
While the baby bump size doesn’t indicate baby size, the baby’s position may matter. Since a baby moves a lot, your bump may look bigger or smaller depending on how your baby lies in your womb.
For this reason, don’t be surprised if one day you look big, and then on the next day, you look smaller.
Does Baby Bump Size Matter?
For many doctors, a baby bump size doesn’t matter as long as the baby has the right size and weight for their gestational age.
You can determine your baby’s size and weight through prenatal check-ups. Ultrasound reports will also estimate the baby’s weight.
Prenatal Care and When to Seek Medical Help
For pregnant mothers, regular prenatal check-ups are important.
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