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9 Signs Your Baby Is Going To Be Big Once They Arrive

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When you're awaiting the birth of a child, your mind is filled with so many questions about what your baby will be like. Bald, or a full head of hair? A champion sleeper, or a night-time terror? A tiny little peanut, or a big bruiser baby? For most of these questions, moms can do nothing but wait and see. But on the issue of size, there are some signs that your baby is going to be big that you can watch out for.

Moms have different reasons for wanting to know beforehand how big their baby is going be. Some want to know whether they should bother buying newborn clothes and diapers, or skip them altogether and go right to the next size up. Others, however, are focused on the physical aspect of it — after all, that baby has to come out somehow and a larger baby could potentially mean a tougher labor.

There's no way to know how big your baby is going to be. But there are many different things that can help you and your doctor make a more accurate guess. Here are nine things that could let you know you’re about to give birth to a big baby.

1Your Ultrasound

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According to Fit Pregnancy, your doctor can estimate your baby's size by taking an ultrasound. It may give you a ballpark figure, but it's important to remember that this isn't an exact science and you could still be in for a surprise no matter what you're told.

2Your Pregnancy Weight Gain

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Gaining more weight than doctors recommend when you're pregnant ups the chances of having a big baby, according to What to Expect. Depending on your pre-pregnancy weight, doctors typically suggest gaining no more than 35 pounds (or 20 if you're considered medically obese).

3You Or Your Partner Are Tall

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Are you or your baby's dad on the taller side? If so, Kids Health noted that your baby might be, too.

4This Isn't Your First Child

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Birth order plays a role in determining your baby's size, according to The Bump. Second (or later) babies tend to be bigger than first borns.

5You've Had Other Big Babies

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Was your first baby on the larger side? If yes, Baby Center noted that you can expect your next baby to be big as well.

6You're Having A Boy

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If you've got a baby boy on the way, you might end up with a big one. The Mayo Clinic reported that boys tend to be slightly larger than girls at birth.

7You Develop Gestational Diabetes

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Being diagnosed with gestational diabetes (GD) significantly raises the chances of having a big baby, according to Stanford Children's Health. GD causes the amount of glucose in your body to spike, and that makes its way to the baby.

8Your Own Birth Weight

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As Baby Center noted, several studies have found that a mother's birth weight is a strong predictor of her baby's size. Interestingly, one such study from the University of Washington found that when it comes to a parent's birthweight as a predictor of infant birthweight, the relationship is strongest between mother-daughter pairs. So, if you were a big baby, and you're having a girl, you just might be having a... big baby girl.

9You're Younger Than 17

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Your age when you get pregnant can have an impact on your baby's size. Moms who are 17 or younger are more likely to give birth to big babies, according to the American College of Obstetricians and Gynecologists.

Check out Romper's new video series, Romper's Doula Diaries: