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A 36-year-old member asked:

will every triplet or twin in identical births have the same developmental disability?

2 doctor answers2 doctors weighed in
Dr. David Finke
Obstetrics and Gynecology 15 years experience
Probably not: Developmental delay/disabilities have many causes, most of which are not genetic. If you are known to carry a genetic disease associated with developmental disability, testing can usually be performed on each fetus individually while still in the uterus. If you are thought to have identical (monozygotic) twins or triplets, then they would all share identical genes.
Dr. John Berryman
Obstetrics and Gynecology 54 years experience
Identical twins: With genetically "identical twins", the positions in the uterus can produce different birth deformities on occasion, with limb compression over time, neurologic deficits can occur. The genetic makeup of identical twins or triplets generally confers the same potential for other medical problems.

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Last updated Nov 12, 2018
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