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Birth to 1 month: The average newborn gains 2/3 to 1 ounce a day and grows 1 to 1 1/2 inches in length over the course of the whole month.
The average weight for a baby at birth is approximately 3.4 kilograms. Newborns range in weight from 2.5 kilograms to 4 kilograms. This average weight is typical for a normal full-term Caucasian newborn.African American and Asian newborns have a slightly smaller weight at birth.ater makes up approximately 80% of a newborn's weight. After the first week and up to six months after birth newborns also gain about 0.198 kg a week. A premature baby weighs less than 2.7 kg.