# You asked: How do I know what size my baby will be?

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What your doctor will do if you measure big or small

## How can I estimate my baby’s birth weight?

For those of you who have a thing for math, here’s the equation: Birth weight (g) = gestational age (days) x (9.38 + 0.264 x fetal sex + 0.000233 x maternal height [cm] x maternal weight at 26.0 weeks [kg] + 4.62 x 3rd-trimester maternal weight gain rate [kg/d]] x [number of previous births + 1]).

## How can I tell how big my unborn baby is?

The simplest way to gauge a baby’s size in utero is to measure an expecting mom’s fundal height. Fundal height measures the distance from your pubic bone to the top of your uterus in centimeters. Your health care practitioner will also palpate your abdomen to get an idea of your baby’s size.

## Can babies predict size?

There’s no proven way to predict a child’s adult height. However, several formulas can provide a reasonable guess for child growth. Here’s a popular example: Add the mother’s height and the father’s height in either inches or centimeters.

## How common is a 10 pound baby?

A newborn receives this designation if he or she weighs 8 pounds, 13 ounces or larger at birth. About 8 percent of the nation’s deliveries involve babies with macrosomia, according to the American College of Obstetricians and Gynecologists. But only 1 percent of newborns weigh 9 pounds, 9 ounces or more.

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## Can you deliver a 9 pound baby naturally?

Although most of these babies are born healthy–women around the world have vaginally delivered babies of 9, 10, and 11 pounds without problems–birth-related complications can include a prolonged labor, intolerance to labor, shoulder dystocia, and neonatal low blood sugar.

## Can a small woman have a big baby?

Many women are able to vaginally deliver a big baby. Even women who we perceive as “small” have very adequate space in their pelvis to fit a baby. Your doctor or midwife can determine your pelvic space during a vaginal exam in the very beginning of your pregnancy.

## How do you know if your baby will be small?

The height of the top of a mother’s uterus can be measured from the pubic bone. This measurement in centimeters usually links with the number of weeks of pregnancy after the 20th week. If the measurement is low for the number of weeks, then the baby may be smaller than expected.

## Can a big baby come early?

If a baby is too large to fit through the birth canal easily, delivery can be difficult. If ultrasound exams during pregnancy show a baby is very large, your healthcare provider may recommend early delivery.

## Are baby weight estimates accurate?

Ultrasound is not very reliable for estimating fetal weight near term. For a 9-pound baby, an ultrasound’s predictive accuracy is typically 15 to 20 percent off. Which means we may over- or underestimate by more than a pound.

## Can a baby be too big to deliver naturally?

Any advice or suggestions? A: A baby that weighs more than 8 lbs 13 ounces at the time of delivery is considered a “macrosomic” or “large for gestational age” baby. There are certainly women delivering all over the world that are able to deliver these larger babies vaginally.

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## Is newborn size the same as 0-3 months?

“Newborn” (NB) represents an average baby at birth up to 21.5 inches long and five to eight pounds. … If she’s a big baby or hits an early growth spurt, you can exchange any extras for the next size up: 0 to 3 months, which usually fits babies anywhere between eight to 12.5 pounds.

## What are the baby sizes?

Baby Clothing

Size Weight Height
Preemie up to 6 lbs / up to 2.7 kg up to 17 in. / up to 43 cm
Newborn 6-9 lbs / 2.7-4.1 kg up to 21.5 in. / up to 55 cm
0 to 3 months 9-12.5 lbs / 4.1 – 5.7 kg 21.5 – 24 in. / 55 – 61 cm
3 to 6 months 12.5 – 17 lbs / 5.7 – 7.7 kg 24 – 26.5 in. / 61 – 67 cm