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.
Fragile X syndrome, the most common heritable form of mental retardation in males, affects ~1/4000 males. It occurs in most ethnic and racial populations, but incidence may vary from group to group. Fragile X syndrome is an X-linked genetic disorder caused by a mutation in the FMR1 gene. Female carriers may pass it on to their children.