What Is the Average Weight of a Newborn Baby Boy?

By Staff Writer | Last Updated August 4, 2015

Newborn baby weights can vary depending on a variety of factors, but the average weight of a newborn, male or female, is between 5 pounds 8 ounces and 8 pounds 13 ounces. However, baby girls are often smaller than boys at birth, but only slightly.

A baby’s birth weight is determined by a variety of factors:

Shorter parents tend to have smaller babies than taller parents.
The mother’s nutritional intake and health during pregnancy can be an indicator, since healthy women tend to have larger babies.
Twins are often smaller at birth than just a single baby.
Babies born on or after their due date often weigh more than babies born prematurely.

Babies who are heavier or lighter than the average weight range are generally healthy, but doctors may monitor them more closely to make sure they are healthy.