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.
Low Birth Weight Causes. The two main causes for a baby to be born at a low birth weight are premature birth and intrauterine growth restrictions (IUGR). Premature birth is a term for a baby born before 37 weeks of pregnancy.Sixty-seven percent of all low birth weight babies are premature births.Many people refer to these newborns as âpreemiesâ. The earlier the baby is born, the less he or she will weigh.Babies born weighing under 3 pounds, 5 ounces are at extremely high risk for health problems at the moment of birth, in the days and weeks after birth, and during their lifetime.remature birth is a term for a baby born before 37 weeks of pregnancy. Sixty-seven percent of all low birth weight babies are premature births. Many people refer to these newborns as âpreemiesâ. The earlier the baby is born, the less he or she will weigh.