# How much should my baby weigh based on birth weight?

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## What weight will my baby be based on birth weight?

This calculator calculates the weight of babies from their birth up to three years.

Calculate Ideal Weight for Infants.

Gender * Boy Girl
Age of your Infant/Child * (Months) Select New Born 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36
Preferred Unit kg lbs

## Can you predict how much your baby will weigh?

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]).

“Many studies have shown that mothers who are [of a higher weight] at the start of their pregnancy have babies who are more likely to be heavier—but is it not clear whether the mother being [heavier] causes her baby to be bigger at birth,” study authors Rachel Freathy, Ph.

## When should a baby double their birth weight?

Expect your baby to double his or her birth weight by about age 5 months. From ages 6 to 12 months, a baby might grow 3/8 inch (about 1 centimeter) a month and gain 3 to 5 ounces (about 85 to 140 grams) a week. Expect your baby to triple his or her birth weight by about age 1 year.

## How can you tell if your baby is going to be big?

Measuring your fundal height: Your doctor will measure your fundal height (the height of your growing uterus). If your belly is measuring larger than expected for how far along you are supposed to be, then you may be carrying a large baby.

## What is an unhealthy birth weight?

Birth weight is the first weight of your baby, taken just after he or she is born. A low birth weight is less than 5.5 pounds. A high birth weight is more than 8.8 pounds. A low birth weight baby can be born too small, too early (premature), or both. This can happen for many different reasons.

## Can baby gain weight if mother doesn t?

Typically, regardless of mother’s weight gain, a baby will grow and develop appropriately.

## What is considered extremely low birth weight?

A birthweight less than 2,500 grams (5 pounds, 8 ounces) is diagnosed as low birthweight. Babies weighing less than 1,500 grams (3 pounds, 4 ounces) at birth are considered very low birthweight.

## Do C section babies weigh more?

One study found that on day 25, babies born by caesarean section had significantly higher weight gain than those born vaginally, while another found that by day 28, babies born vaginally gained more weight per day (11.9 g/kg/day) than those born by caesarean section (10.9 g/kg/day; p = .

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## Can newborns gain too much weight?

Many babies double their birth weight by age 4 to 6 months and triple their birth weight by their first birthday. But babies who gain more slowly or more quickly may be perfectly healthy too.

## What age does birth weight quadruple?

1 to 2 Years. On average, your baby’s weight will roughly quadruple by the time they are about 2 and a half years old. 38﻿ At this age, there are calculations you can use to estimate your child’s adult height.