# How is baby weight determined?

Contents

## What determines the weight of a baby?

A child inherits half their genes from their mother and half from their father, and the child’s own resulting genetic make-up plays a role in birth weight. The paper reveals the complex balance of how both the mother’s genes and the baby’s genes can influence the baby’s growth.

## Does the mother or father determine birth weight?

A father’s genetic code influences the weight of a baby at birth, according to a new study led by the UCL Institute of Child Health (ICH).

## Can you predict how big your baby will be?

Add the mother’s height and the father’s height in either inches or centimeters. Add 5 inches (13 centimeters) for boys or subtract 5 inches (13 centimeters) for girls. Divide by two.

## How is baby’s weight determined by ultrasound?

Ultrasound uses volumes to calculate fetal weight. It takes measurements of the head, waist circumference and some bones and comes up with an estimate. But it can’t measure the density of the fetal tissues directly.

## Can baby gain weight if mother doesn t?

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

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## What are the signs of a big baby?

A larger than expected fundal height could be a sign of fetal macrosomia. Excessive amniotic fluid (polyhydramnios). Having too much amniotic fluid — the fluid that surrounds and protects a baby during pregnancy — might be a sign that your baby is larger than average.

## Will my baby be big if my husband was big?

We’ve got the answer. Yep, giving birth to big babies can be hereditary. In general, babies tend to be in the same weight range as their parents. In other words, if you were nine pounds, eight ounces at birth, it’s incredibly unlikely that you’ll give birth to a five-and-a-half-pound peanut.

## Does size of mother affect size of baby?

One study in the journal JAMA, though, sheds some light on the factors that connect the two—and found clear evidence that mom’s weight, blood sugar levels and blood pressure directly affect baby’s weight.

## Can I be induced at 38 weeks if baby is big?

The authors of this analysis conclude that induction of labour at 38 weeks’ gestation or later is a “reasonable option” in women with a larger than normal baby. Healthcare professionals may wish to use these findings when advising pregnant women of their options.

## 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.