When chromosomal abnormalities occur,

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Chromosomal abnormalities are common and occur in about 1 in every 150 live births. Most of these abnormalities result in miscarriage early in the pregnancy, often before the woman even knows she is pregnant. However, some chromosomal abnormalities can result in the birth of a viable fetus, but these babies may have severe health problems or intellectual disabilities. In some rare cases, surgery may be able to correct certain chromosomal abnormalities, but this is not common.

When Chromosomal Abnormalities Occur