<prompt> Microsomia is defined asBih weight below 90th percentileBih weight below 10th percentileBih weight below 20th percentileBih weight below 50th percentile  <response>: A neonate whose weight falls between the 10th and 90th percentile for gestational age is considered as Appropriate for gestational age AGA. If the weight falls below the 10th percentile, the neonate is classified as Small for gestational age SGA or microsomic. If the weight falls at or above the 90th percentile, then the neonate is classified as Large for gestational age LGA or macrosomic. Reference : page 137 Ghai Essential Pediatrics 8th edition 