For the second group of areas (which included 10 areas with valid data), the EPAâs analysis calculated an average across the areas of maximum monitor annual mean concentrations, averaged over 3 years, of 14.8 mg/ m 3 compared to an average of composite monitor concentrations of 14.2 mg/m 3 (Frank, 2012a, Table 3).
Updated February 24, 2017. The mean or average birth weight in the United States is about 3,389g or 7 lb, 7.5 oz. However, any birth weight of a term newborn between 5 lbs, 8 oz and 8 lbs, 13 oz is considered to be normal. Baby Birth Weight Statistics.
A full-term baby averages a little over 19 inches in length. This remarkable growth occurs over the course of nine months. During the last four weeks of pregnancy, body growth slows as the baby puts on weight â mostly in the form of body fat â in preparation for birth. The last four weeks of pregnancy are weeks 36 through 40.