There are some serious congenital abnormalities and inborn errors of metabolism that leads to disability and death of an infant. Some of these conditions have effective treatment or management if detected early. By the time the symptoms are manifested it is often too late and causes severe physical and mental disability in what could have been a completely normal child.Hence it is imperative in diagnosing these disorders at the earliest. In the developed countries all the newborn babies are screened for these conditions through a newborn screening programme (NBS).