What is the most common cause of mental retardation?

There can be biologicial factors as a cause of mental retardation. Also, the way the mother takes care of herself during her pregnancy is a big cue. Like smoking, drinking, drugs that type of thing. Some babies are just born with a genetic defect that causes mental retardation.

Liberals.

lack of oxygen to the brain b4 birth

Most common causeof mental retardation is the defected on chromosome 21 will lead to a down syndrome.

Pregnant women over the age of 40 will have a higher risk of having a down syndrome child than younger pregnant women.

it sometimes depends on the mother, example if she abused drugs or something was physically sick while caring the baby. it also runs in familys.

Being born with an extra chromosome (down syndrome)

The most common cause of this is not having proper nutrition by the mother in first trimester. Folic acid is one of the key substances that help with developing a healthy baby.

lady above 45 yr old got higher risk of getting retarded baby cos of chromosome.so it's always advisable not to marry late.

Being the presidential son of a former President.

birth defects (no offence people)

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