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.
The Long and Short of It. Babies delivered at the standard 40-week mark measure an average of 20.16 inches long, according to BabyCenter.com. A baby born at 41 weeks gestation measures an average of 20.35 inches. A baby delivered between 38 and 39 weeks measures an average of between 19.61 inches and 19.96 inches. Of course, babies who are born prematurely tend to be smaller in length than babies who are born full-term.