Pounds per square inch. The pound per square inch or, more accurately, pound-force per square inch (symbol: lbf/in2; abbreviation: psi) is a unit of pressure or of stress based on avoirdupois units. It is the pressure resulting from a force of one pound-force applied to an area of one square inch:
small for gesÂ·taÂ·tionÂ·al age. Infant whose birth weight is below the tenth percentile for gestational age. small for gestational age. SGA. 1. Term describing an infant whose birth weight is at or below the 10th percentile, as correlated with the number of weeks in utero on the intrauterine growth chart.
Large for gestational age (LGA) is how health professionals describe newborns who weighing more than the usual amount for the number of weeks of pregnancy. Babies are called LGA if they weigh more than 90 percent of all babies of the same gestational age.The average baby weighs about 7 pounds at birth. About 9 percent of all babies weigh more than 8 pounds, 13 ounces (4,000 grams). Rarely do babies weigh over 10 pounds.Although most LGA babies are born at term (37 to 41 weeks of pregnancy), a few premature babies may be LGA.bout 9 percent of all babies weigh more than 8 pounds, 13 ounces (4,000 grams). Rarely do babies weigh over 10 pounds. Although most LGA babies are born at term (37 to 41 weeks of pregnancy), a few premature babies may be LGA.