newborn screening is done in babies to detect for any birth
defects.. its better to take preventive measures than to regret
later, because babies who have any birth defects and the babies who
do not have look same at birth, it is only when the symptoms
appears one can come to know about the disease but that sometimes
may be too late for the treatment and that often leads to death of
infants, which can be avoided if newborn screening is done at the
time of birth.