at the age of 1 and a half. or 19 months. at the age of 1 and a
half. or 19 months.
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There are no vaccinations available.
The causes and risks factors are maternal age. Have babies at
early age as the risks increases with age. About 1:2000 live births
in age 20 to 1:300 at age 35 to 1:40 at age 45.