Will every triplet or twin in identical births have the same learning disability?

Partial risk: Most twin/triplet studies i've looked at cite a risk of up to 30% in identicals & half that with fraternal twin/triplets. The reliability of the data may not apply to all ld's but do allow parents to be vigilant and aware that more than one may be affected.

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.

No: Identical twins share some disorders to a high degree (e.g., adhd, bipolar disorder), but learning disabilities are not a specific disorder, rather a heterogenous grouping of brain dysfunctions that may affect learning. Multiples are at higher risk for ld's because of shortened gestation, increased incidence of neonatal problems, & decreased intrauterine nutrition.