mpumalangabased medical practitioner dr midah maluleka says: "there is an extra number 21 chromosome (trisomy 21) which causes delays in physical and intellectual development.

midah maluleka utsi, "kunelinani lelingetiwe le21 chromosone (itrisomy 21) lelibanga kube nekubambeleleka kweku khula kwemtimba nekwe ngcondvo.
