This can also be called small-for gestational age (SGA) or fetal growth restriction. There are basically two different types of IUGR: Symmetric or primary IUGR is characterized by all internal organs being reduced in size. Symmetric IUGR accounts for 20% to 25% of all cases of IUGR.
Fragile X syndrome (FXS), also known as MartinâBell syndrome, or Escalante's syndrome (more commonly used in South American countries), is a genetic syndrome.
The cause for Fragile X syndrome is mutation in one gene, the Fragile X Mental Retardation 1 gene, or the FMR1 gene. It is present on the X chromosome. This results in mental retardation. Mental retardation is further linked with more than five hundred different conditions.