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

udkt midah maluleka ose benza njengodokotela empu malanga uthi, "kuba khona ukwengezeka kwichromo some lama21 ( itrisomy 21) nokuyaye kubambezele ukukhula komzimba kanye nengqondo.
