Intellectual disability is the most common type of childhood disability, affecting about 1-3% of children.

Genetic disorders are the leading cause of intellectual disability, accounting for about 50% of cases.

Autistic disorder is the most common type of autism spectrum disorder, affecting about 1 in 100 children.

Genetic factors are the leading cause of autism spectrum disorder, although the exact cause is unknown.

Spastic cerebral palsy is the most common type of cerebral palsy, affecting about 80% of children with the condition.

Birth injuries are the leading cause of cerebral palsy, accounting for about 50% of cases.

Trisomy 21 is the most common type of Down syndrome, accounting for about 95% of cases.

Advanced maternal age is the leading cause of Down syndrome, with the risk increasing significantly after the age of 35.

Leukemia is the most common type of childhood cancer, accounting for about 30% of cases.

Genetic factors are the leading cause of childhood cancer, although the exact cause is unknown.

Congenital heart defects are the most common type of childhood heart disease, affecting about 1% of children.

Genetic factors are the leading cause of congenital heart defects, although the exact cause is unknown.

Type 1 diabetes is the most common type of childhood diabetes, accounting for about 95% of cases.

Genetic factors are the leading cause of type 1 diabetes, although the exact cause is unknown.

Allergic asthma is the most common type of childhood asthma, accounting for about 80% of cases.

Environmental factors, such as exposure to allergens and air pollution, are the leading cause of childhood asthma.