Causes of disabilities can be broadly classified into which of the following cate gories?

(A) Pre-Natal
(B) Post-Natal
(C) Pro-Natal

(D) Perinatal

The correct option is (A), (B), and (D) only.

To understand the causes of developmental and congenital disabilities, medical and developmental sciences broadly classify these causes based on the developmental stage at which the damaging event occurs relative to childbirth. These valid categories are defined as follows:
1. Pre-Natal (A): These causes occur during pregnancy, before the birth of the child. They include genetic or chromosomal abnormalities, maternal infections (such as rubella or cytomegalovirus), maternal malnutrition, or exposure to teratogens like alcohol, drugs, and environmental toxins.
2. Perinatal (D): These causes occur around the time of birth, typically defined from the 22nd completed week of gestation up to 7 days after birth. Examples include birth asphyxia (deprivation of oxygen during delivery), premature birth, low birth weight, birth injuries, or infections contracted during delivery.
3. Post-Natal (B): These causes occur after birth, during infancy, childhood, or later in life. They include traumatic injuries (such as head trauma from accidents), severe childhood infections (like meningitis or encephalitis), ingestion of toxins (such as lead), and severe malnutrition or deprivation.

In contrast, Pro-Natal (C) is a demographic or sociological term associated with promoting or encouraging childbearing (pronatalism). It has no relation to developmental biology or the classifications of the causes of disabilities.

Thus, only Pre-Natal, Post-Natal, and Perinatal represent the recognized classification stages for causes of disabilities, which corresponds to (A), (B), and (D) only.